diff --git a/src/main/generated/com/codecrafters/companity/user/adapter/infrastructure/jpa/QUserEntity.java b/src/main/generated/com/codecrafters/companity/user/adapter/infrastructure/jpa/QUserEntity.java
new file mode 100644
index 0000000..37bf284
--- /dev/null
+++ b/src/main/generated/com/codecrafters/companity/user/adapter/infrastructure/jpa/QUserEntity.java
@@ -0,0 +1,41 @@
+package com.codecrafters.companity.user.adapter.infrastructure.jpa;
+
+import static com.querydsl.core.types.PathMetadataFactory.*;
+
+import com.querydsl.core.types.dsl.*;
+
+import com.querydsl.core.types.PathMetadata;
+import javax.annotation.processing.Generated;
+import com.querydsl.core.types.Path;
+
+
+/**
+ * QUserEntity is a Querydsl query type for UserEntity
+ */
+@Generated("com.querydsl.codegen.DefaultEntitySerializer")
+public class QUserEntity extends EntityPathBase<UserEntity> {
+
+    private static final long serialVersionUID = 1701790324L;
+
+    public static final QUserEntity userEntity = new QUserEntity("userEntity");
+
+    public final StringPath nickName = createString("nickName");
+
+    public final StringPath userId = createString("userId");
+
+    public final StringPath userName = createString("userName");
+
+    public QUserEntity(String variable) {
+        super(UserEntity.class, forVariable(variable));
+    }
+
+    public QUserEntity(Path<? extends UserEntity> path) {
+        super(path.getType(), path.getMetadata());
+    }
+
+    public QUserEntity(PathMetadata metadata) {
+        super(UserEntity.class, metadata);
+    }
+
+}
+
diff --git a/src/main/generated/com/codecrafters/companity/user/adapter/jpa/QUserEntity.java b/src/main/generated/com/codecrafters/companity/user/adapter/jpa/QUserEntity.java
new file mode 100644
index 0000000..a51b5bd
--- /dev/null
+++ b/src/main/generated/com/codecrafters/companity/user/adapter/jpa/QUserEntity.java
@@ -0,0 +1,42 @@
+package com.codecrafters.companity.user.adapter.jpa;
+
+import static com.querydsl.core.types.PathMetadataFactory.*;
+
+import com.codecrafters.companity.user.adapter.infrastructure.jpa.UserEntity;
+import com.querydsl.core.types.dsl.*;
+
+import com.querydsl.core.types.PathMetadata;
+import javax.annotation.processing.Generated;
+import com.querydsl.core.types.Path;
+
+
+/**
+ * QUserEntity is a Querydsl query type for UserEntity
+ */
+@Generated("com.querydsl.codegen.DefaultEntitySerializer")
+public class QUserEntity extends EntityPathBase<UserEntity> {
+
+    private static final long serialVersionUID = 586088658L;
+
+    public static final QUserEntity userEntity = new QUserEntity("userEntity");
+
+    public final NumberPath<Long> id = createNumber("id", Long.class);
+
+    public final StringPath name = createString("name");
+
+    public final StringPath nickName = createString("nickName");
+
+    public QUserEntity(String variable) {
+        super(UserEntity.class, forVariable(variable));
+    }
+
+    public QUserEntity(Path<? extends UserEntity> path) {
+        super(path.getType(), path.getMetadata());
+    }
+
+    public QUserEntity(PathMetadata metadata) {
+        super(UserEntity.class, metadata);
+    }
+
+}
+
diff --git a/src/main/java/com/codecrafters/companity/adapter/user/UserController.java b/src/main/java/com/codecrafters/companity/adapter/user/UserController.java
deleted file mode 100644
index 8bcd909..0000000
--- a/src/main/java/com/codecrafters/companity/adapter/user/UserController.java
+++ /dev/null
@@ -1,32 +0,0 @@
-package com.codecrafters.companity.adapter.user;
-
-import com.codecrafters.companity.adapter.user.dto.request.UserCreateRequest;
-import com.codecrafters.companity.adapter.user.dto.resposne.UserCreateResponse;
-import com.codecrafters.companity.application.in.usecase.UserUseCase;
-import com.codecrafters.companity.domain.user.User;
-import lombok.RequiredArgsConstructor;
-import org.springframework.http.HttpStatus;
-import org.springframework.http.ResponseEntity;
-import org.springframework.web.bind.annotation.PostMapping;
-import org.springframework.web.bind.annotation.RequestBody;
-import org.springframework.web.bind.annotation.RequestMapping;
-import org.springframework.web.bind.annotation.RestController;
-
-import java.util.HashMap;
-import java.util.Map;
-
-@RestController
-@RequestMapping("/users")
-@RequiredArgsConstructor
-public class UserController {
-
-    private final UserUseCase userUseCase;
-
-    @PostMapping
-    public ResponseEntity<UserCreateResponse> signUp (@RequestBody UserCreateRequest request) {
-        User user = userUseCase.signUp(request);
-        UserCreateResponse response = UserCreateResponse.from(user);
-
-        return new ResponseEntity<>(response, HttpStatus.OK);
-    }
-}
diff --git a/src/main/java/com/codecrafters/companity/adapter/user/infrastructure/UserRepositoryImpl.java b/src/main/java/com/codecrafters/companity/adapter/user/infrastructure/UserRepositoryImpl.java
deleted file mode 100644
index 2086f17..0000000
--- a/src/main/java/com/codecrafters/companity/adapter/user/infrastructure/UserRepositoryImpl.java
+++ /dev/null
@@ -1,32 +0,0 @@
-package com.codecrafters.companity.adapter.user.infrastructure;
-
-import com.codecrafters.companity.adapter.user.infrastructure.jpa.UserEntity;
-import com.codecrafters.companity.adapter.user.infrastructure.jpa.UserJPARepository;
-import com.codecrafters.companity.application.out.persistence.UserRepository;
-import com.codecrafters.companity.domain.user.User;
-import lombok.RequiredArgsConstructor;
-import org.springframework.stereotype.Repository;
-
-@Repository
-@RequiredArgsConstructor
-public class UserRepositoryImpl implements UserRepository {
-    private final UserJPARepository userJPARepository;
-
-    @Override
-    public User save(User user) {
-        UserEntity entity = UserEntity.from(user);
-        userJPARepository.save(entity);
-
-        return User.builder()
-                .userId(entity.getUserId())
-                .userName(entity.getUserName())
-                .nickName(entity.getNickName())
-                .build();
-    }
-
-    @Override
-    public User getUserById(String userId) {
-        UserEntity userEntity = userJPARepository.getById(userId);
-        return userEntity.toDomain();
-    }
-}
diff --git a/src/main/java/com/codecrafters/companity/application/in/usecase/UserUseCase.java b/src/main/java/com/codecrafters/companity/application/in/usecase/UserUseCase.java
deleted file mode 100644
index 1be7b40..0000000
--- a/src/main/java/com/codecrafters/companity/application/in/usecase/UserUseCase.java
+++ /dev/null
@@ -1,8 +0,0 @@
-package com.codecrafters.companity.application.in.usecase;
-
-import com.codecrafters.companity.adapter.user.dto.request.UserCreateRequest;
-import com.codecrafters.companity.domain.user.User;
-
-public interface UserUseCase {
-    public User signUp(UserCreateRequest user);
-}
diff --git a/src/main/java/com/codecrafters/companity/application/out/persistence/UserRepository.java b/src/main/java/com/codecrafters/companity/application/out/persistence/UserRepository.java
deleted file mode 100644
index 947fa77..0000000
--- a/src/main/java/com/codecrafters/companity/application/out/persistence/UserRepository.java
+++ /dev/null
@@ -1,8 +0,0 @@
-package com.codecrafters.companity.application.out.persistence;
-
-import com.codecrafters.companity.domain.user.User;
-
-public interface UserRepository {
-    User save(User user);
-    User getUserById(String userId);
-}
diff --git a/src/main/java/com/codecrafters/companity/application/service/user/UserService.java b/src/main/java/com/codecrafters/companity/application/service/user/UserService.java
deleted file mode 100644
index d31b4f1..0000000
--- a/src/main/java/com/codecrafters/companity/application/service/user/UserService.java
+++ /dev/null
@@ -1,23 +0,0 @@
-package com.codecrafters.companity.application.service.user;
-
-import com.codecrafters.companity.adapter.user.dto.request.UserCreateRequest;
-import com.codecrafters.companity.application.in.usecase.UserUseCase;
-import com.codecrafters.companity.application.out.persistence.UserRepository;
-import com.codecrafters.companity.domain.user.User;
-import lombok.RequiredArgsConstructor;
-import org.springframework.stereotype.Service;
-
-@Service
-@RequiredArgsConstructor
-public class UserService implements UserUseCase {
-
-    private final UserRepository userRepository;
-
-    @Override
-    public User signUp(UserCreateRequest request) {
-        User user = User.from(request);
-        user.validateUser();
-        return userRepository.save(user);
-    }
-
-}
diff --git a/src/main/java/com/codecrafters/companity/adapter/post/out/ResponseComment.java b/src/main/java/com/codecrafters/companity/comment/adapter/dto/response/ResponseComment.java
similarity index 59%
rename from src/main/java/com/codecrafters/companity/adapter/post/out/ResponseComment.java
rename to src/main/java/com/codecrafters/companity/comment/adapter/dto/response/ResponseComment.java
index 027adf5..31ea375 100644
--- a/src/main/java/com/codecrafters/companity/adapter/post/out/ResponseComment.java
+++ b/src/main/java/com/codecrafters/companity/comment/adapter/dto/response/ResponseComment.java
@@ -1,6 +1,6 @@
-package com.codecrafters.companity.adapter.post.out;
+package com.codecrafters.companity.comment.adapter.dto.response;
 
-import com.codecrafters.companity.adapter.user.ResponseUser;
+import com.codecrafters.companity.user.adapter.ResponseUser;
 
 import java.time.LocalDateTime;
 
diff --git a/src/main/java/com/codecrafters/companity/adapter/infrastructure/jpa/comment/CommentEntity.java b/src/main/java/com/codecrafters/companity/comment/adapter/infrastructure/jpa/CommentEntity.java
similarity index 61%
rename from src/main/java/com/codecrafters/companity/adapter/infrastructure/jpa/comment/CommentEntity.java
rename to src/main/java/com/codecrafters/companity/comment/adapter/infrastructure/jpa/CommentEntity.java
index 48f6f87..f82fb75 100644
--- a/src/main/java/com/codecrafters/companity/adapter/infrastructure/jpa/comment/CommentEntity.java
+++ b/src/main/java/com/codecrafters/companity/comment/adapter/infrastructure/jpa/CommentEntity.java
@@ -1,14 +1,12 @@
-package com.codecrafters.companity.adapter.infrastructure.jpa.comment;
+package com.codecrafters.companity.comment.adapter.infrastructure.jpa;
 
-import com.codecrafters.companity.adapter.infrastructure.jpa.common.BaseTimeEntity;
-import com.codecrafters.companity.adapter.infrastructure.jpa.post.PostEntity;
-import com.codecrafters.companity.adapter.user.infrastructure.jpa.UserEntity;
+import com.codecrafters.companity.common.adapter.infrastructure.jpa.BaseTimeEntity;
+import com.codecrafters.companity.post.adapter.infrastructure.jpa.PostEntity;
+import com.codecrafters.companity.user.adapter.infrastructure.jpa.UserEntity;
 import jakarta.persistence.*;
 import lombok.Getter;
 import lombok.Setter;
 
-import java.time.LocalDateTime;
-
 @Entity(name = "Comment")
 @Getter
 @Setter
diff --git a/src/main/java/com/codecrafters/companity/domain/post/Comment.java b/src/main/java/com/codecrafters/companity/comment/domain/Comment.java
similarity index 62%
rename from src/main/java/com/codecrafters/companity/domain/post/Comment.java
rename to src/main/java/com/codecrafters/companity/comment/domain/Comment.java
index b0d6d1e..16a522b 100644
--- a/src/main/java/com/codecrafters/companity/domain/post/Comment.java
+++ b/src/main/java/com/codecrafters/companity/comment/domain/Comment.java
@@ -1,6 +1,6 @@
-package com.codecrafters.companity.domain.post;
+package com.codecrafters.companity.comment.domain;
 
-import com.codecrafters.companity.domain.user.User;
+import com.codecrafters.companity.user.domain.User;
 
 import java.time.LocalDateTime;
 
diff --git a/src/main/java/com/codecrafters/companity/common/adapter/ExceptionControllerAdvice.java b/src/main/java/com/codecrafters/companity/common/adapter/ExceptionControllerAdvice.java
new file mode 100644
index 0000000..58903e3
--- /dev/null
+++ b/src/main/java/com/codecrafters/companity/common/adapter/ExceptionControllerAdvice.java
@@ -0,0 +1,23 @@
+package com.codecrafters.companity.common.adapter;
+
+import com.codecrafters.companity.common.adapter.dto.response.ExceptionResponse;
+import com.codecrafters.companity.exception.CustomException;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.ExceptionHandler;
+import org.springframework.web.bind.annotation.RestControllerAdvice;
+
+
+@RestControllerAdvice(basePackages = "com.codecrafters.companity")
+public class ExceptionControllerAdvice {
+    @ExceptionHandler(IllegalArgumentException.class)
+    public ResponseEntity<Object> exceptionHandler(IllegalArgumentException e) {
+        return new ResponseEntity<Object>(e.getMessage(), HttpStatus.BAD_REQUEST);
+    }
+
+    @ExceptionHandler(CustomException.class)
+    public ResponseEntity<ExceptionResponse> exceptionHandler(CustomException e) {
+
+        return ExceptionResponse.toResponseEntity(e);
+    }
+}
diff --git a/src/main/java/com/codecrafters/companity/adapter/utility/LocalDateTimeProvider.java b/src/main/java/com/codecrafters/companity/common/adapter/LocalDateTimeProvider.java
similarity index 66%
rename from src/main/java/com/codecrafters/companity/adapter/utility/LocalDateTimeProvider.java
rename to src/main/java/com/codecrafters/companity/common/adapter/LocalDateTimeProvider.java
index 8da3a4c..7d6e65e 100644
--- a/src/main/java/com/codecrafters/companity/adapter/utility/LocalDateTimeProvider.java
+++ b/src/main/java/com/codecrafters/companity/common/adapter/LocalDateTimeProvider.java
@@ -1,6 +1,6 @@
-package com.codecrafters.companity.adapter.utility;
+package com.codecrafters.companity.common.adapter;
 
-import com.codecrafters.companity.application.out.utility.DateTimeProvider;
+import com.codecrafters.companity.common.application.DateTimeProvider;
 import org.springframework.stereotype.Component;
 
 import java.time.LocalDateTime;
diff --git a/src/main/java/com/codecrafters/companity/common/adapter/dto/response/ExceptionResponse.java b/src/main/java/com/codecrafters/companity/common/adapter/dto/response/ExceptionResponse.java
new file mode 100644
index 0000000..9f624a7
--- /dev/null
+++ b/src/main/java/com/codecrafters/companity/common/adapter/dto/response/ExceptionResponse.java
@@ -0,0 +1,24 @@
+package com.codecrafters.companity.common.adapter.dto.response;
+
+import com.codecrafters.companity.exception.CustomException;
+import lombok.Builder;
+import org.springframework.http.ResponseEntity;
+
+@Builder
+public class ExceptionResponse {
+    private String code;
+    private String msg;
+
+    public static ResponseEntity<ExceptionResponse> toResponseEntity(CustomException ex) {
+        ResultCode errorType = ex.getResultCode();
+        String message = ex.getMessage();
+
+        return ResponseEntity
+                .status(ex.getStatus())
+                .body(ExceptionResponse.builder()
+                        .code(errorType.getCode())
+                        .msg(errorType.getMsg())
+                        .build());
+    }
+
+}
diff --git a/src/main/java/com/codecrafters/companity/common/adapter/dto/response/ResultCode.java b/src/main/java/com/codecrafters/companity/common/adapter/dto/response/ResultCode.java
new file mode 100644
index 0000000..ae37ff6
--- /dev/null
+++ b/src/main/java/com/codecrafters/companity/common/adapter/dto/response/ResultCode.java
@@ -0,0 +1,14 @@
+package com.codecrafters.companity.common.adapter.dto.response;
+
+import lombok.Getter;
+import lombok.RequiredArgsConstructor;
+
+@Getter
+@RequiredArgsConstructor
+public enum ResultCode {
+    UNKNOWN("UNKNOWN", "unchecked exception"),
+    USER_NOT_FOUND("USER_NOT_FOUND", "user not found exception.");
+
+    private final String code;
+    private final String msg;
+}
diff --git a/src/main/java/com/codecrafters/companity/adapter/infrastructure/jpa/common/BaseTimeEntity.java b/src/main/java/com/codecrafters/companity/common/adapter/infrastructure/jpa/BaseTimeEntity.java
similarity index 88%
rename from src/main/java/com/codecrafters/companity/adapter/infrastructure/jpa/common/BaseTimeEntity.java
rename to src/main/java/com/codecrafters/companity/common/adapter/infrastructure/jpa/BaseTimeEntity.java
index a7a4c8b..5933808 100644
--- a/src/main/java/com/codecrafters/companity/adapter/infrastructure/jpa/common/BaseTimeEntity.java
+++ b/src/main/java/com/codecrafters/companity/common/adapter/infrastructure/jpa/BaseTimeEntity.java
@@ -1,4 +1,4 @@
-package com.codecrafters.companity.adapter.infrastructure.jpa.common;
+package com.codecrafters.companity.common.adapter.infrastructure.jpa;
 
 import jakarta.persistence.EntityListeners;
 import jakarta.persistence.MappedSuperclass;
diff --git a/src/main/java/com/codecrafters/companity/application/out/utility/DateTimeProvider.java b/src/main/java/com/codecrafters/companity/common/application/DateTimeProvider.java
similarity index 62%
rename from src/main/java/com/codecrafters/companity/application/out/utility/DateTimeProvider.java
rename to src/main/java/com/codecrafters/companity/common/application/DateTimeProvider.java
index 9cbcec6..cebbf5a 100644
--- a/src/main/java/com/codecrafters/companity/application/out/utility/DateTimeProvider.java
+++ b/src/main/java/com/codecrafters/companity/common/application/DateTimeProvider.java
@@ -1,4 +1,4 @@
-package com.codecrafters.companity.application.out.utility;
+package com.codecrafters.companity.common.application;
 
 import java.time.LocalDateTime;
 
diff --git a/src/main/java/com/codecrafters/companity/config/mapper/CustomModelMapper.java b/src/main/java/com/codecrafters/companity/config/mapper/CustomModelMapper.java
index 7b78e16..df05f1c 100644
--- a/src/main/java/com/codecrafters/companity/config/mapper/CustomModelMapper.java
+++ b/src/main/java/com/codecrafters/companity/config/mapper/CustomModelMapper.java
@@ -1,9 +1,9 @@
 package com.codecrafters.companity.config.mapper;
 
-import com.codecrafters.companity.adapter.post.out.ResponsePost;
-import com.codecrafters.companity.domain.enums.City;
-import com.codecrafters.companity.domain.enums.Sport;
-import com.codecrafters.companity.domain.post.Post;
+import com.codecrafters.companity.post.adapter.dto.response.ResponsePost;
+import com.codecrafters.companity.post.domain.enums.City;
+import com.codecrafters.companity.post.domain.enums.Sport;
+import com.codecrafters.companity.post.domain.Post;
 import org.modelmapper.Converter;
 import org.modelmapper.ModelMapper;
 import org.modelmapper.config.Configuration;
diff --git a/src/main/java/com/codecrafters/companity/domain/post/OrderType.java b/src/main/java/com/codecrafters/companity/domain/post/OrderType.java
deleted file mode 100644
index 2ce3105..0000000
--- a/src/main/java/com/codecrafters/companity/domain/post/OrderType.java
+++ /dev/null
@@ -1,5 +0,0 @@
-package com.codecrafters.companity.domain.post;
-
-public enum OrderType {
-    RecentDate, Favorite
-}
diff --git a/src/main/java/com/codecrafters/companity/exception/CustomException.java b/src/main/java/com/codecrafters/companity/exception/CustomException.java
new file mode 100644
index 0000000..75dd7cf
--- /dev/null
+++ b/src/main/java/com/codecrafters/companity/exception/CustomException.java
@@ -0,0 +1,49 @@
+package com.codecrafters.companity.exception;
+
+import com.codecrafters.companity.common.adapter.dto.response.ResultCode;
+import lombok.Getter;
+import org.springframework.http.HttpStatus;
+
+@Getter
+public class CustomException extends RuntimeException{
+    private final HttpStatus status;
+    private final ResultCode resultCode;
+    private final String message;
+
+    public CustomException(HttpStatus status, ResultCode resultCode, String message) {
+        this.status = status;
+        this.resultCode = resultCode;
+        this.message = message;
+    }
+
+    public CustomException(HttpStatus status, ResultCode resultCode, Throwable cause) {
+        this.status = status;
+        this.resultCode = resultCode;
+        this.message = cause.getMessage();
+    }
+
+    public CustomException(HttpStatus status, CustomException customException) {
+        this.status = status;
+        this.resultCode = customException.getResultCode();
+        this.message = customException.getMessage();
+    }
+
+    public CustomException(HttpStatus status, Throwable cause) {
+        this.status = status;
+        this.resultCode = ResultCode.UNKNOWN;
+        this.message = cause.getMessage();
+    }
+
+    public CustomException(Exception exception) {
+        if (exception.getClass() == CustomException.class) {
+            CustomException customException = (CustomException) exception;
+            this.status = customException.getStatus();
+            this.resultCode = customException.getResultCode();
+            this.message = customException.getMessage();
+        } else {
+            this.status = HttpStatus.BAD_REQUEST;
+            this.resultCode = ResultCode.UNKNOWN;
+            this.message = exception.getMessage();
+        }
+    }
+}
diff --git a/src/main/java/com/codecrafters/companity/adapter/post/PostController.java b/src/main/java/com/codecrafters/companity/post/adapter/PostController.java
similarity index 76%
rename from src/main/java/com/codecrafters/companity/adapter/post/PostController.java
rename to src/main/java/com/codecrafters/companity/post/adapter/PostController.java
index e40ebc3..6c80658 100644
--- a/src/main/java/com/codecrafters/companity/adapter/post/PostController.java
+++ b/src/main/java/com/codecrafters/companity/post/adapter/PostController.java
@@ -1,11 +1,11 @@
-package com.codecrafters.companity.adapter.post;
+package com.codecrafters.companity.post.adapter;
 
-import com.codecrafters.companity.application.out.persistence.PostCriteria;
-import com.codecrafters.companity.adapter.post.in.RequestPost;
-import com.codecrafters.companity.adapter.post.out.ResponsePost;
-import com.codecrafters.companity.application.in.usecase.PostUseCase;
+import com.codecrafters.companity.post.application.port.out.persistence.PostCriteria;
+import com.codecrafters.companity.post.adapter.dto.request.RequestPost;
+import com.codecrafters.companity.post.adapter.dto.response.ResponsePost;
+import com.codecrafters.companity.post.application.port.in.PostUseCase;
 import com.codecrafters.companity.config.mapper.CompanityObjectMapper;
-import com.codecrafters.companity.domain.post.Post;
+import com.codecrafters.companity.post.domain.Post;
 import lombok.RequiredArgsConstructor;
 import lombok.extern.slf4j.Slf4j;
 import org.springframework.http.HttpStatus;
diff --git a/src/main/java/com/codecrafters/companity/adapter/post/in/RequestPost.java b/src/main/java/com/codecrafters/companity/post/adapter/dto/request/RequestPost.java
similarity index 65%
rename from src/main/java/com/codecrafters/companity/adapter/post/in/RequestPost.java
rename to src/main/java/com/codecrafters/companity/post/adapter/dto/request/RequestPost.java
index a690b0a..11805b4 100644
--- a/src/main/java/com/codecrafters/companity/adapter/post/in/RequestPost.java
+++ b/src/main/java/com/codecrafters/companity/post/adapter/dto/request/RequestPost.java
@@ -1,4 +1,4 @@
-package com.codecrafters.companity.adapter.post.in;
+package com.codecrafters.companity.post.adapter.dto.request;
 
 import lombok.Getter;
 import lombok.Setter;
diff --git a/src/main/java/com/codecrafters/companity/adapter/post/out/ResponsePost.java b/src/main/java/com/codecrafters/companity/post/adapter/dto/response/ResponsePost.java
similarity index 75%
rename from src/main/java/com/codecrafters/companity/adapter/post/out/ResponsePost.java
rename to src/main/java/com/codecrafters/companity/post/adapter/dto/response/ResponsePost.java
index 7c054a8..d8d3e12 100644
--- a/src/main/java/com/codecrafters/companity/adapter/post/out/ResponsePost.java
+++ b/src/main/java/com/codecrafters/companity/post/adapter/dto/response/ResponsePost.java
@@ -1,6 +1,6 @@
-package com.codecrafters.companity.adapter.post.out;
+package com.codecrafters.companity.post.adapter.dto.response;
 
-import com.codecrafters.companity.adapter.user.ResponseUser;
+import com.codecrafters.companity.user.adapter.ResponseUser;
 import lombok.Getter;
 import lombok.Setter;
 
diff --git a/src/main/java/com/codecrafters/companity/adapter/infrastructure/jpa/post/PostRepositoryImpl.java b/src/main/java/com/codecrafters/companity/post/adapter/infrastructure/PostRepositoryImpl.java
similarity index 75%
rename from src/main/java/com/codecrafters/companity/adapter/infrastructure/jpa/post/PostRepositoryImpl.java
rename to src/main/java/com/codecrafters/companity/post/adapter/infrastructure/PostRepositoryImpl.java
index 3b0bc9b..91e9eea 100644
--- a/src/main/java/com/codecrafters/companity/adapter/infrastructure/jpa/post/PostRepositoryImpl.java
+++ b/src/main/java/com/codecrafters/companity/post/adapter/infrastructure/PostRepositoryImpl.java
@@ -1,12 +1,14 @@
-package com.codecrafters.companity.adapter.infrastructure.jpa.post;
+package com.codecrafters.companity.post.adapter.infrastructure;
 
-import com.codecrafters.companity.application.out.persistence.PostRepository;
-import com.codecrafters.companity.application.out.persistence.PostCriteria;
+import com.codecrafters.companity.post.adapter.infrastructure.jpa.PostEntity;
+import com.codecrafters.companity.post.adapter.infrastructure.jpa.PostJPARepository;
+import com.codecrafters.companity.post.application.port.out.persistence.PostRepository;
+import com.codecrafters.companity.post.application.port.out.persistence.PostCriteria;
 import com.codecrafters.companity.config.mapper.CompanityObjectMapper;
-import com.codecrafters.companity.domain.enums.City;
-import com.codecrafters.companity.domain.enums.Sport;
-import com.codecrafters.companity.domain.post.OrderType;
-import com.codecrafters.companity.domain.post.Post;
+import com.codecrafters.companity.post.domain.enums.City;
+import com.codecrafters.companity.post.domain.enums.Sport;
+import com.codecrafters.companity.post.domain.enums.OrderType;
+import com.codecrafters.companity.post.domain.Post;
 import com.querydsl.core.types.OrderSpecifier;
 import com.querydsl.core.types.dsl.BooleanExpression;
 import com.querydsl.jpa.impl.JPAQueryFactory;
@@ -15,7 +17,7 @@
 
 import java.util.List;
 
-import static com.codecrafters.companity.adapter.infrastructure.jpa.post.QPostEntity.postEntity;
+import static com.codecrafters.companity.post.adapter.infrastructure.jpa.QPostEntity.postEntity;
 
 
 @Repository
diff --git a/src/main/java/com/codecrafters/companity/adapter/infrastructure/jpa/post/PostEntity.java b/src/main/java/com/codecrafters/companity/post/adapter/infrastructure/jpa/PostEntity.java
similarity index 63%
rename from src/main/java/com/codecrafters/companity/adapter/infrastructure/jpa/post/PostEntity.java
rename to src/main/java/com/codecrafters/companity/post/adapter/infrastructure/jpa/PostEntity.java
index e42e596..0c505bd 100644
--- a/src/main/java/com/codecrafters/companity/adapter/infrastructure/jpa/post/PostEntity.java
+++ b/src/main/java/com/codecrafters/companity/post/adapter/infrastructure/jpa/PostEntity.java
@@ -1,10 +1,10 @@
-package com.codecrafters.companity.adapter.infrastructure.jpa.post;
+package com.codecrafters.companity.post.adapter.infrastructure.jpa;
 
-import com.codecrafters.companity.adapter.infrastructure.jpa.comment.CommentEntity;
-import com.codecrafters.companity.adapter.infrastructure.jpa.common.BaseTimeEntity;
-import com.codecrafters.companity.adapter.user.infrastructure.jpa.UserEntity;
-import com.codecrafters.companity.domain.enums.City;
-import com.codecrafters.companity.domain.enums.Sport;
+import com.codecrafters.companity.comment.adapter.infrastructure.jpa.CommentEntity;
+import com.codecrafters.companity.common.adapter.infrastructure.jpa.BaseTimeEntity;
+import com.codecrafters.companity.user.adapter.infrastructure.jpa.UserEntity;
+import com.codecrafters.companity.post.domain.enums.City;
+import com.codecrafters.companity.post.domain.enums.Sport;
 import jakarta.persistence.*;
 import lombok.Getter;
 
diff --git a/src/main/java/com/codecrafters/companity/adapter/infrastructure/jpa/post/PostJPARepository.java b/src/main/java/com/codecrafters/companity/post/adapter/infrastructure/jpa/PostJPARepository.java
similarity index 67%
rename from src/main/java/com/codecrafters/companity/adapter/infrastructure/jpa/post/PostJPARepository.java
rename to src/main/java/com/codecrafters/companity/post/adapter/infrastructure/jpa/PostJPARepository.java
index 4804c2c..c464677 100644
--- a/src/main/java/com/codecrafters/companity/adapter/infrastructure/jpa/post/PostJPARepository.java
+++ b/src/main/java/com/codecrafters/companity/post/adapter/infrastructure/jpa/PostJPARepository.java
@@ -1,4 +1,4 @@
-package com.codecrafters.companity.adapter.infrastructure.jpa.post;
+package com.codecrafters.companity.post.adapter.infrastructure.jpa;
 
 import org.springframework.data.jpa.repository.JpaRepository;
 
diff --git a/src/main/java/com/codecrafters/companity/application/service/post/PostFactory.java b/src/main/java/com/codecrafters/companity/post/application/PostFactory.java
similarity index 79%
rename from src/main/java/com/codecrafters/companity/application/service/post/PostFactory.java
rename to src/main/java/com/codecrafters/companity/post/application/PostFactory.java
index afc5a90..36acb11 100644
--- a/src/main/java/com/codecrafters/companity/application/service/post/PostFactory.java
+++ b/src/main/java/com/codecrafters/companity/post/application/PostFactory.java
@@ -1,8 +1,8 @@
-package com.codecrafters.companity.application.service.post;
+package com.codecrafters.companity.post.application;
 
 import com.codecrafters.companity.config.mapper.CompanityObjectMapper;
-import com.codecrafters.companity.domain.post.Post;
-import com.codecrafters.companity.domain.user.User;
+import com.codecrafters.companity.post.domain.Post;
+import com.codecrafters.companity.user.domain.User;
 import lombok.RequiredArgsConstructor;
 import org.springframework.stereotype.Component;
 
diff --git a/src/main/java/com/codecrafters/companity/application/service/post/PostService.java b/src/main/java/com/codecrafters/companity/post/application/PostService.java
similarity index 68%
rename from src/main/java/com/codecrafters/companity/application/service/post/PostService.java
rename to src/main/java/com/codecrafters/companity/post/application/PostService.java
index e85875b..773a6f9 100644
--- a/src/main/java/com/codecrafters/companity/application/service/post/PostService.java
+++ b/src/main/java/com/codecrafters/companity/post/application/PostService.java
@@ -1,12 +1,12 @@
-package com.codecrafters.companity.application.service.post;
-
-import com.codecrafters.companity.application.in.usecase.PostUseCase;
-import com.codecrafters.companity.application.out.persistence.PostCriteria;
-import com.codecrafters.companity.application.out.utility.DateTimeProvider;
-import com.codecrafters.companity.application.out.persistence.PostRepository;
-import com.codecrafters.companity.application.out.persistence.UserRepository;
-import com.codecrafters.companity.domain.post.Post;
-import com.codecrafters.companity.domain.user.User;
+package com.codecrafters.companity.post.application;
+
+import com.codecrafters.companity.post.application.port.in.PostUseCase;
+import com.codecrafters.companity.post.application.port.out.persistence.PostCriteria;
+import com.codecrafters.companity.common.application.DateTimeProvider;
+import com.codecrafters.companity.post.application.port.out.persistence.PostRepository;
+import com.codecrafters.companity.user.application.port.out.UserRepository;
+import com.codecrafters.companity.post.domain.Post;
+import com.codecrafters.companity.user.domain.User;
 import lombok.RequiredArgsConstructor;
 import lombok.extern.slf4j.Slf4j;
 import org.springframework.stereotype.Service;
diff --git a/src/main/java/com/codecrafters/companity/application/in/usecase/PostUseCase.java b/src/main/java/com/codecrafters/companity/post/application/port/in/PostUseCase.java
similarity index 53%
rename from src/main/java/com/codecrafters/companity/application/in/usecase/PostUseCase.java
rename to src/main/java/com/codecrafters/companity/post/application/port/in/PostUseCase.java
index e8b7145..dc07647 100644
--- a/src/main/java/com/codecrafters/companity/application/in/usecase/PostUseCase.java
+++ b/src/main/java/com/codecrafters/companity/post/application/port/in/PostUseCase.java
@@ -1,7 +1,7 @@
-package com.codecrafters.companity.application.in.usecase;
+package com.codecrafters.companity.post.application.port.in;
 
-import com.codecrafters.companity.application.out.persistence.PostCriteria;
-import com.codecrafters.companity.domain.post.Post;
+import com.codecrafters.companity.post.application.port.out.persistence.PostCriteria;
+import com.codecrafters.companity.post.domain.Post;
 
 import java.util.List;
 
diff --git a/src/main/java/com/codecrafters/companity/application/out/persistence/PostCriteria.java b/src/main/java/com/codecrafters/companity/post/application/port/out/persistence/PostCriteria.java
similarity index 55%
rename from src/main/java/com/codecrafters/companity/application/out/persistence/PostCriteria.java
rename to src/main/java/com/codecrafters/companity/post/application/port/out/persistence/PostCriteria.java
index 52114a6..a5a7b92 100644
--- a/src/main/java/com/codecrafters/companity/application/out/persistence/PostCriteria.java
+++ b/src/main/java/com/codecrafters/companity/post/application/port/out/persistence/PostCriteria.java
@@ -1,8 +1,8 @@
-package com.codecrafters.companity.application.out.persistence;
+package com.codecrafters.companity.post.application.port.out.persistence;
 
-import com.codecrafters.companity.domain.enums.City;
-import com.codecrafters.companity.domain.enums.Sport;
-import com.codecrafters.companity.domain.post.OrderType;
+import com.codecrafters.companity.post.domain.enums.City;
+import com.codecrafters.companity.post.domain.enums.Sport;
+import com.codecrafters.companity.post.domain.enums.OrderType;
 import lombok.Builder;
 import lombok.Getter;
 import lombok.Setter;
diff --git a/src/main/java/com/codecrafters/companity/application/out/persistence/PostRepository.java b/src/main/java/com/codecrafters/companity/post/application/port/out/persistence/PostRepository.java
similarity index 65%
rename from src/main/java/com/codecrafters/companity/application/out/persistence/PostRepository.java
rename to src/main/java/com/codecrafters/companity/post/application/port/out/persistence/PostRepository.java
index 41d3429..9c8f919 100644
--- a/src/main/java/com/codecrafters/companity/application/out/persistence/PostRepository.java
+++ b/src/main/java/com/codecrafters/companity/post/application/port/out/persistence/PostRepository.java
@@ -1,6 +1,6 @@
-package com.codecrafters.companity.application.out.persistence;
+package com.codecrafters.companity.post.application.port.out.persistence;
 
-import com.codecrafters.companity.domain.post.Post;
+import com.codecrafters.companity.post.domain.Post;
 
 import java.util.List;
 
diff --git a/src/main/java/com/codecrafters/companity/domain/post/Post.java b/src/main/java/com/codecrafters/companity/post/domain/Post.java
similarity index 64%
rename from src/main/java/com/codecrafters/companity/domain/post/Post.java
rename to src/main/java/com/codecrafters/companity/post/domain/Post.java
index 3a2f8a6..3559672 100644
--- a/src/main/java/com/codecrafters/companity/domain/post/Post.java
+++ b/src/main/java/com/codecrafters/companity/post/domain/Post.java
@@ -1,8 +1,9 @@
-package com.codecrafters.companity.domain.post;
+package com.codecrafters.companity.post.domain;
 
-import com.codecrafters.companity.domain.enums.City;
-import com.codecrafters.companity.domain.enums.Sport;
-import com.codecrafters.companity.domain.user.User;
+import com.codecrafters.companity.comment.domain.Comment;
+import com.codecrafters.companity.post.domain.enums.City;
+import com.codecrafters.companity.post.domain.enums.Sport;
+import com.codecrafters.companity.user.domain.User;
 import lombok.*;
 
 import java.time.LocalDateTime;
diff --git a/src/main/java/com/codecrafters/companity/domain/enums/City.java b/src/main/java/com/codecrafters/companity/post/domain/enums/City.java
similarity index 92%
rename from src/main/java/com/codecrafters/companity/domain/enums/City.java
rename to src/main/java/com/codecrafters/companity/post/domain/enums/City.java
index 07f874e..60b28f0 100644
--- a/src/main/java/com/codecrafters/companity/domain/enums/City.java
+++ b/src/main/java/com/codecrafters/companity/post/domain/enums/City.java
@@ -1,4 +1,4 @@
-package com.codecrafters.companity.domain.enums;
+package com.codecrafters.companity.post.domain.enums;
 
 public enum City {
     Seoul(0 ,"서울시"),
diff --git a/src/main/java/com/codecrafters/companity/post/domain/enums/OrderType.java b/src/main/java/com/codecrafters/companity/post/domain/enums/OrderType.java
new file mode 100644
index 0000000..861768f
--- /dev/null
+++ b/src/main/java/com/codecrafters/companity/post/domain/enums/OrderType.java
@@ -0,0 +1,5 @@
+package com.codecrafters.companity.post.domain.enums;
+
+public enum OrderType {
+    RecentDate, Favorite
+}
diff --git a/src/main/java/com/codecrafters/companity/domain/enums/Sport.java b/src/main/java/com/codecrafters/companity/post/domain/enums/Sport.java
similarity index 88%
rename from src/main/java/com/codecrafters/companity/domain/enums/Sport.java
rename to src/main/java/com/codecrafters/companity/post/domain/enums/Sport.java
index f2ba9f2..ab17af0 100644
--- a/src/main/java/com/codecrafters/companity/domain/enums/Sport.java
+++ b/src/main/java/com/codecrafters/companity/post/domain/enums/Sport.java
@@ -1,4 +1,4 @@
-package com.codecrafters.companity.domain.enums;
+package com.codecrafters.companity.post.domain.enums;
 
 public enum Sport {
     Badminton(0 ,"배드민턴"),
diff --git a/src/main/java/com/codecrafters/companity/adapter/user/ResponseUser.java b/src/main/java/com/codecrafters/companity/user/adapter/ResponseUser.java
similarity index 62%
rename from src/main/java/com/codecrafters/companity/adapter/user/ResponseUser.java
rename to src/main/java/com/codecrafters/companity/user/adapter/ResponseUser.java
index c2d2ac0..302cfeb 100644
--- a/src/main/java/com/codecrafters/companity/adapter/user/ResponseUser.java
+++ b/src/main/java/com/codecrafters/companity/user/adapter/ResponseUser.java
@@ -1,4 +1,4 @@
-package com.codecrafters.companity.adapter.user;
+package com.codecrafters.companity.user.adapter;
 public class ResponseUser {
     private Long id;
     private String nickname;
diff --git a/src/main/java/com/codecrafters/companity/user/adapter/UserController.java b/src/main/java/com/codecrafters/companity/user/adapter/UserController.java
new file mode 100644
index 0000000..e699450
--- /dev/null
+++ b/src/main/java/com/codecrafters/companity/user/adapter/UserController.java
@@ -0,0 +1,42 @@
+package com.codecrafters.companity.user.adapter;
+
+import com.codecrafters.companity.user.adapter.dto.request.UserCreateRequest;
+import com.codecrafters.companity.user.adapter.dto.request.UserUpdateRequest;
+import com.codecrafters.companity.user.adapter.dto.resposne.UserCreateResponse;
+import com.codecrafters.companity.user.application.port.in.UserUseCase;
+import com.codecrafters.companity.user.domain.User;
+import lombok.RequiredArgsConstructor;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.*;
+
+@RestController
+@RequestMapping("/users")
+@RequiredArgsConstructor
+public class UserController {
+
+    private final UserUseCase userUseCase;
+
+    @PostMapping
+    public ResponseEntity<UserCreateResponse> signUp (@RequestBody UserCreateRequest request) {
+        User user = userUseCase.signUp(request);
+        UserCreateResponse response = UserCreateResponse.from(user);
+
+        return new ResponseEntity<>(response, HttpStatus.CREATED);
+    }
+
+    @DeleteMapping("/{userId}")
+    public ResponseEntity<HttpStatus> delete (@PathVariable("userId") String userId) throws Exception {
+        userUseCase.delete(userId);
+
+        return new ResponseEntity<>(HttpStatus.NO_CONTENT);
+    }
+
+    // FIXME: 인증 Token을 이용해 userId를 가져오는 방식으로 변경 필요 /users/{userId}/nick-name -> /users/nick-name
+    @PatchMapping("/{userId}/nick-name")
+    public ResponseEntity<HttpStatus> signUp (@PathVariable("userId") String userId, @RequestBody UserUpdateRequest request) {
+        User user = userUseCase.updateNickName(userId, request.getNickName());
+
+        return new ResponseEntity<>(HttpStatus.NO_CONTENT);
+    }
+}
diff --git a/src/main/java/com/codecrafters/companity/adapter/user/dto/request/UserCreateRequest.java b/src/main/java/com/codecrafters/companity/user/adapter/dto/request/UserCreateRequest.java
similarity index 89%
rename from src/main/java/com/codecrafters/companity/adapter/user/dto/request/UserCreateRequest.java
rename to src/main/java/com/codecrafters/companity/user/adapter/dto/request/UserCreateRequest.java
index 91667a4..0b0758e 100644
--- a/src/main/java/com/codecrafters/companity/adapter/user/dto/request/UserCreateRequest.java
+++ b/src/main/java/com/codecrafters/companity/user/adapter/dto/request/UserCreateRequest.java
@@ -1,4 +1,4 @@
-package com.codecrafters.companity.adapter.user.dto.request;
+package com.codecrafters.companity.user.adapter.dto.request;
 
 import com.fasterxml.jackson.annotation.JsonProperty;
 import lombok.AllArgsConstructor;
diff --git a/src/main/java/com/codecrafters/companity/user/adapter/dto/request/UserUpdateRequest.java b/src/main/java/com/codecrafters/companity/user/adapter/dto/request/UserUpdateRequest.java
new file mode 100644
index 0000000..a601f13
--- /dev/null
+++ b/src/main/java/com/codecrafters/companity/user/adapter/dto/request/UserUpdateRequest.java
@@ -0,0 +1,19 @@
+package com.codecrafters.companity.user.adapter.dto.request;
+
+import com.fasterxml.jackson.annotation.JsonProperty;
+import lombok.Getter;
+
+/**
+ * UserId는 PK이므로 변경되지 않는다.
+ */
+@Getter
+public class UserUpdateRequest {
+    private final String userName;
+    private final String nickName;
+
+    public UserUpdateRequest(@JsonProperty("userName") String userName, @JsonProperty("nickName") String nickName) {
+        this.userName = userName;
+        this.nickName = nickName;
+    }
+
+}
diff --git a/src/main/java/com/codecrafters/companity/adapter/user/dto/resposne/UserCreateResponse.java b/src/main/java/com/codecrafters/companity/user/adapter/dto/resposne/UserCreateResponse.java
similarity index 81%
rename from src/main/java/com/codecrafters/companity/adapter/user/dto/resposne/UserCreateResponse.java
rename to src/main/java/com/codecrafters/companity/user/adapter/dto/resposne/UserCreateResponse.java
index ea9e9ff..0e17b4a 100644
--- a/src/main/java/com/codecrafters/companity/adapter/user/dto/resposne/UserCreateResponse.java
+++ b/src/main/java/com/codecrafters/companity/user/adapter/dto/resposne/UserCreateResponse.java
@@ -1,7 +1,7 @@
-package com.codecrafters.companity.adapter.user.dto.resposne;
+package com.codecrafters.companity.user.adapter.dto.resposne;
 
 
-import com.codecrafters.companity.domain.user.User;
+import com.codecrafters.companity.user.domain.User;
 import lombok.Getter;
 
 @Getter
diff --git a/src/main/java/com/codecrafters/companity/user/adapter/infrastructure/UserRepositoryImpl.java b/src/main/java/com/codecrafters/companity/user/adapter/infrastructure/UserRepositoryImpl.java
new file mode 100644
index 0000000..c10be35
--- /dev/null
+++ b/src/main/java/com/codecrafters/companity/user/adapter/infrastructure/UserRepositoryImpl.java
@@ -0,0 +1,43 @@
+package com.codecrafters.companity.user.adapter.infrastructure;
+
+import com.codecrafters.companity.user.adapter.infrastructure.jpa.UserEntity;
+import com.codecrafters.companity.user.adapter.infrastructure.jpa.UserJPARepository;
+import com.codecrafters.companity.common.adapter.dto.response.ResultCode;
+import com.codecrafters.companity.user.application.port.out.UserRepository;
+import com.codecrafters.companity.user.domain.User;
+import com.codecrafters.companity.exception.CustomException;
+import lombok.RequiredArgsConstructor;
+import org.springframework.http.HttpStatus;
+import org.springframework.stereotype.Repository;
+
+@Repository
+@RequiredArgsConstructor
+public class UserRepositoryImpl implements UserRepository {
+    private final UserJPARepository userJPARepository;
+
+    @Override
+    public User save(User user) {
+        UserEntity entity = UserEntity.from(user);
+        userJPARepository.save(entity);
+
+        return User.builder()
+                .userId(entity.getUserId())
+                .userName(entity.getUserName())
+                .nickName(entity.getNickName())
+                .build();
+    }
+
+    @Override
+    public User getUserById(String userId){
+        UserEntity userEntity = userJPARepository.findById(userId).orElseThrow(() -> {
+            throw new CustomException(HttpStatus.BAD_REQUEST, ResultCode.USER_NOT_FOUND, "user not found. userId : " + userId);
+        });
+
+        return userEntity.toDomain();
+    }
+
+    @Override
+    public void deleteById(String userId) {
+        userJPARepository.deleteById(userId);
+    }
+}
diff --git a/src/main/java/com/codecrafters/companity/adapter/user/infrastructure/jpa/UserEntity.java b/src/main/java/com/codecrafters/companity/user/adapter/infrastructure/jpa/UserEntity.java
similarity index 89%
rename from src/main/java/com/codecrafters/companity/adapter/user/infrastructure/jpa/UserEntity.java
rename to src/main/java/com/codecrafters/companity/user/adapter/infrastructure/jpa/UserEntity.java
index d632fb0..3babdb2 100644
--- a/src/main/java/com/codecrafters/companity/adapter/user/infrastructure/jpa/UserEntity.java
+++ b/src/main/java/com/codecrafters/companity/user/adapter/infrastructure/jpa/UserEntity.java
@@ -1,9 +1,9 @@
-package com.codecrafters.companity.adapter.user.infrastructure.jpa;
+package com.codecrafters.companity.user.adapter.infrastructure.jpa;
 
 import jakarta.persistence.Column;
 import lombok.Getter;
 
-import com.codecrafters.companity.domain.user.User;
+import com.codecrafters.companity.user.domain.User;
 import jakarta.persistence.Entity;
 import jakarta.persistence.Id;
 import lombok.Builder;
diff --git a/src/main/java/com/codecrafters/companity/adapter/user/infrastructure/jpa/UserJPARepository.java b/src/main/java/com/codecrafters/companity/user/adapter/infrastructure/jpa/UserJPARepository.java
similarity index 69%
rename from src/main/java/com/codecrafters/companity/adapter/user/infrastructure/jpa/UserJPARepository.java
rename to src/main/java/com/codecrafters/companity/user/adapter/infrastructure/jpa/UserJPARepository.java
index e40444a..ca9bcb4 100644
--- a/src/main/java/com/codecrafters/companity/adapter/user/infrastructure/jpa/UserJPARepository.java
+++ b/src/main/java/com/codecrafters/companity/user/adapter/infrastructure/jpa/UserJPARepository.java
@@ -1,4 +1,4 @@
-package com.codecrafters.companity.adapter.user.infrastructure.jpa;
+package com.codecrafters.companity.user.adapter.infrastructure.jpa;
 
 import org.springframework.data.jpa.repository.JpaRepository;
 
diff --git a/src/main/java/com/codecrafters/companity/user/application/UserService.java b/src/main/java/com/codecrafters/companity/user/application/UserService.java
new file mode 100644
index 0000000..8ec9e03
--- /dev/null
+++ b/src/main/java/com/codecrafters/companity/user/application/UserService.java
@@ -0,0 +1,40 @@
+package com.codecrafters.companity.user.application;
+
+import com.codecrafters.companity.user.adapter.dto.request.UserCreateRequest;
+import com.codecrafters.companity.user.application.port.in.UserUseCase;
+import com.codecrafters.companity.user.application.port.out.UserRepository;
+import com.codecrafters.companity.user.domain.User;
+import lombok.RequiredArgsConstructor;
+import org.springframework.stereotype.Service;
+
+@Service
+@RequiredArgsConstructor
+public class UserService implements UserUseCase {
+
+    private final UserRepository userRepository;
+
+    @Override
+    public User signUp(UserCreateRequest request) {
+        User user = User.from(request);
+        user.validateCreateUser();
+
+        return userRepository.save(user);
+    }
+
+    @Override
+    public User updateNickName(String userId, String nickName) {
+        User user = userRepository.getUserById(userId);
+        user.updateNickName(nickName);
+
+        return userRepository.save(user);
+    }
+
+    @Override
+    public void delete(String userId) {
+        User user = userRepository.getUserById(userId);
+        if (user == null) throw new IllegalArgumentException("user not found with UserID : " + userId);
+
+        userRepository.deleteById(userId);
+    }
+
+}
diff --git a/src/main/java/com/codecrafters/companity/user/application/port/in/UserUseCase.java b/src/main/java/com/codecrafters/companity/user/application/port/in/UserUseCase.java
new file mode 100644
index 0000000..c45d2bd
--- /dev/null
+++ b/src/main/java/com/codecrafters/companity/user/application/port/in/UserUseCase.java
@@ -0,0 +1,10 @@
+package com.codecrafters.companity.user.application.port.in;
+
+import com.codecrafters.companity.user.adapter.dto.request.UserCreateRequest;
+import com.codecrafters.companity.user.domain.User;
+
+public interface UserUseCase {
+    public User signUp(UserCreateRequest user);
+    public User updateNickName(String userId, String nickName);
+    public void delete(String userId) throws Exception;
+}
diff --git a/src/main/java/com/codecrafters/companity/user/application/port/out/UserRepository.java b/src/main/java/com/codecrafters/companity/user/application/port/out/UserRepository.java
new file mode 100644
index 0000000..e9470a3
--- /dev/null
+++ b/src/main/java/com/codecrafters/companity/user/application/port/out/UserRepository.java
@@ -0,0 +1,10 @@
+package com.codecrafters.companity.user.application.port.out;
+
+import com.codecrafters.companity.user.domain.User;
+
+public interface UserRepository {
+    User save(User user);
+    User getUserById(String userId);
+
+    void deleteById(String userId);
+}
diff --git a/src/main/java/com/codecrafters/companity/domain/user/User.java b/src/main/java/com/codecrafters/companity/user/domain/User.java
similarity index 79%
rename from src/main/java/com/codecrafters/companity/domain/user/User.java
rename to src/main/java/com/codecrafters/companity/user/domain/User.java
index 07d3c75..d02a7e3 100644
--- a/src/main/java/com/codecrafters/companity/domain/user/User.java
+++ b/src/main/java/com/codecrafters/companity/user/domain/User.java
@@ -1,12 +1,11 @@
-package com.codecrafters.companity.domain.user;
+package com.codecrafters.companity.user.domain;
 
-import com.codecrafters.companity.adapter.user.dto.request.UserCreateRequest;
+import com.codecrafters.companity.user.adapter.dto.request.UserCreateRequest;
 import lombok.*;
 
 import java.util.Objects;
 
 @Getter
-@Setter
 @Builder
 @AllArgsConstructor(access = AccessLevel.PRIVATE)
 @NoArgsConstructor(access = AccessLevel.PRIVATE)
@@ -26,8 +25,12 @@ public boolean equals(Object o) {
         return Objects.equals(userId, user.userId) && Objects.equals(userName, user.userName) && Objects.equals(nickName, user.nickName);
     }
 
-    public void validateUser() {
+    public void validateCreateUser() {
         if (this.userId == null) throw new IllegalArgumentException("userId is required.");
         if (this.userName == null) throw  new IllegalArgumentException("userName is required.");
     }
+
+    public void updateNickName(String nickName) {
+        this.nickName = nickName;
+    }
 }
diff --git a/src/test/java/com/codecrafters/companity/adapter/infrastructure/jpa/post/PostRepositoryImplTest.java b/src/test/java/com/codecrafters/companity/adapter/infrastructure/jpa/post/PostRepositoryImplTest.java
index 843ed63..44c7ab0 100644
--- a/src/test/java/com/codecrafters/companity/adapter/infrastructure/jpa/post/PostRepositoryImplTest.java
+++ b/src/test/java/com/codecrafters/companity/adapter/infrastructure/jpa/post/PostRepositoryImplTest.java
@@ -1,11 +1,13 @@
 package com.codecrafters.companity.adapter.infrastructure.jpa.post;
 
 import com.codecrafters.companity.config.mapper.CustomModelMapper;
-import com.codecrafters.companity.application.out.persistence.PostCriteria;
+import com.codecrafters.companity.post.adapter.infrastructure.jpa.PostJPARepository;
+import com.codecrafters.companity.post.adapter.infrastructure.PostRepositoryImpl;
+import com.codecrafters.companity.post.application.port.out.persistence.PostCriteria;
 import com.codecrafters.companity.config.QuerydslConfig;
-import com.codecrafters.companity.domain.enums.City;
-import com.codecrafters.companity.domain.enums.Sport;
-import com.codecrafters.companity.domain.post.OrderType;
+import com.codecrafters.companity.post.domain.enums.City;
+import com.codecrafters.companity.post.domain.enums.Sport;
+import com.codecrafters.companity.post.domain.enums.OrderType;
 import com.querydsl.jpa.impl.JPAQueryFactory;
 import org.junit.jupiter.api.Test;
 import org.springframework.beans.factory.annotation.Autowired;
diff --git a/src/test/java/com/codecrafters/companity/adapter/infrastructure/jpa/user/UserRepositoryImplTest.java b/src/test/java/com/codecrafters/companity/adapter/infrastructure/jpa/user/UserRepositoryImplTest.java
index cccd49e..43fda70 100644
--- a/src/test/java/com/codecrafters/companity/adapter/infrastructure/jpa/user/UserRepositoryImplTest.java
+++ b/src/test/java/com/codecrafters/companity/adapter/infrastructure/jpa/user/UserRepositoryImplTest.java
@@ -1,6 +1,6 @@
 package com.codecrafters.companity.adapter.infrastructure.jpa.user;
 
-import com.codecrafters.companity.application.out.persistence.UserRepository;
+import com.codecrafters.companity.user.application.port.out.UserRepository;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.boot.test.context.SpringBootTest;
 
diff --git a/src/test/java/com/codecrafters/companity/application/service/post/PostServiceTest.java b/src/test/java/com/codecrafters/companity/application/service/post/PostServiceTest.java
index 7c2ade5..7bedd2e 100644
--- a/src/test/java/com/codecrafters/companity/application/service/post/PostServiceTest.java
+++ b/src/test/java/com/codecrafters/companity/application/service/post/PostServiceTest.java
@@ -2,11 +2,13 @@
 
 import com.codecrafters.companity.mock.repository.PostInMemoryImpl;
 import com.codecrafters.companity.mock.repository.UserInMemoryImpl;
-import com.codecrafters.companity.application.out.persistence.PostRepository;
-import com.codecrafters.companity.application.out.persistence.UserRepository;
+import com.codecrafters.companity.post.application.port.out.persistence.PostRepository;
+import com.codecrafters.companity.post.application.PostFactory;
+import com.codecrafters.companity.post.application.PostService;
+import com.codecrafters.companity.user.application.port.out.UserRepository;
 import com.codecrafters.companity.config.mapper.CustomModelMapper;
-import com.codecrafters.companity.domain.post.Post;
-import com.codecrafters.companity.domain.user.User;
+import com.codecrafters.companity.post.domain.Post;
+import com.codecrafters.companity.user.domain.User;
 import com.codecrafters.companity.mock.TestDateTimeProvider;
 import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Test;
diff --git a/src/test/java/com/codecrafters/companity/application/service/user/UserServiceTest.java b/src/test/java/com/codecrafters/companity/application/service/user/UserServiceTest.java
index 91819f7..3854004 100644
--- a/src/test/java/com/codecrafters/companity/application/service/user/UserServiceTest.java
+++ b/src/test/java/com/codecrafters/companity/application/service/user/UserServiceTest.java
@@ -1,8 +1,10 @@
 package com.codecrafters.companity.application.service.user;
 
-import com.codecrafters.companity.adapter.user.dto.request.UserCreateRequest;
-import com.codecrafters.companity.application.out.persistence.UserRepository;
-import com.codecrafters.companity.domain.user.User;
+import com.codecrafters.companity.user.adapter.dto.request.UserCreateRequest;
+import com.codecrafters.companity.user.application.UserService;
+import com.codecrafters.companity.user.application.port.out.UserRepository;
+import com.codecrafters.companity.user.domain.User;
+import com.codecrafters.companity.exception.CustomException;
 import com.codecrafters.companity.mock.repository.UserInMemoryImpl;
 import org.junit.jupiter.api.Assertions;
 import org.junit.jupiter.api.Test;
@@ -17,6 +19,7 @@ public class UserServiceTest {
     public UserServiceTest() {
         userRepository = new UserInMemoryImpl();
         userService = new UserService(userRepository);
+        userRepository.save(User.builder().userId(USER_ID).userName(USER_NAME).nickName(NICKNAME).build());
     }
 
     @Test
@@ -34,4 +37,36 @@ public UserServiceTest() {
             Assertions.assertEquals(request.getNickName(), user.getNickName());
         });
     }
+
+    @Test
+    public void 사용자의_nickName을_변경할_수_있다() {
+        //given
+        String userId = USER_ID;
+        String newNickName = "NEW_NICK_NAME";
+
+        //when
+        User newUser = userService.updateNickName(userId, newNickName);
+
+        //then
+        Assertions.assertAll(() -> {
+            Assertions.assertEquals(userId, newUser.getUserId());
+            Assertions.assertEquals(USER_NAME, newUser.getUserName());
+            Assertions.assertEquals(newNickName, newUser.getNickName());
+        });
+    }
+
+    @Test
+    public void userId에_해당하는_특정_User를_삭제할_수_있다() {
+        //given
+        String userId = USER_ID;
+        UserCreateRequest request = new UserCreateRequest(userId, USER_NAME, NICKNAME);
+        User user = userService.signUp(request);
+
+        //when
+        userService.delete(userId);
+
+        //then
+        Assertions.assertThrows(CustomException.class, () -> userRepository.getUserById(userId));
+    }
+
 }
diff --git a/src/test/java/com/codecrafters/companity/adapter/utility/CustomModelMapperTest.java b/src/test/java/com/codecrafters/companity/common/adapter/CustomModelMapperTest.java
similarity index 95%
rename from src/test/java/com/codecrafters/companity/adapter/utility/CustomModelMapperTest.java
rename to src/test/java/com/codecrafters/companity/common/adapter/CustomModelMapperTest.java
index f830a40..d379716 100644
--- a/src/test/java/com/codecrafters/companity/adapter/utility/CustomModelMapperTest.java
+++ b/src/test/java/com/codecrafters/companity/common/adapter/CustomModelMapperTest.java
@@ -1,8 +1,8 @@
-package com.codecrafters.companity.adapter.utility;
+package com.codecrafters.companity.common.adapter;
 
-import com.codecrafters.companity.adapter.infrastructure.jpa.post.PostEntity;
+import com.codecrafters.companity.post.adapter.infrastructure.jpa.PostEntity;
 import com.codecrafters.companity.config.mapper.CustomModelMapper;
-import com.codecrafters.companity.domain.post.Post;
+import com.codecrafters.companity.post.domain.Post;
 import org.junit.jupiter.api.Test;
 
 import java.util.ArrayList;
diff --git a/src/test/java/com/codecrafters/companity/domain/post/PostFactoryTest.java b/src/test/java/com/codecrafters/companity/domain/post/PostFactoryTest.java
index f26cccb..d4016a0 100644
--- a/src/test/java/com/codecrafters/companity/domain/post/PostFactoryTest.java
+++ b/src/test/java/com/codecrafters/companity/domain/post/PostFactoryTest.java
@@ -1,8 +1,9 @@
 package com.codecrafters.companity.domain.post;
 
-import com.codecrafters.companity.application.service.post.PostFactory;
+import com.codecrafters.companity.post.application.PostFactory;
 import com.codecrafters.companity.config.mapper.CustomModelMapper;
-import com.codecrafters.companity.domain.user.User;
+import com.codecrafters.companity.post.domain.Post;
+import com.codecrafters.companity.user.domain.User;
 import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Test;
 
diff --git a/src/test/java/com/codecrafters/companity/domain/user/UserTest.java b/src/test/java/com/codecrafters/companity/domain/user/UserTest.java
index 0f9c7c1..254d2b5 100644
--- a/src/test/java/com/codecrafters/companity/domain/user/UserTest.java
+++ b/src/test/java/com/codecrafters/companity/domain/user/UserTest.java
@@ -1,6 +1,7 @@
 package com.codecrafters.companity.domain.user;
 
-import com.codecrafters.companity.adapter.user.dto.request.UserCreateRequest;
+import com.codecrafters.companity.user.adapter.dto.request.UserCreateRequest;
+import com.codecrafters.companity.user.domain.User;
 import org.junit.jupiter.api.Assertions;
 import org.junit.jupiter.api.Test;
 
@@ -34,8 +35,29 @@ public class UserTest {
         //when
 
         //then
-        Assertions.assertThrows(IllegalArgumentException.class, () -> userCase1.validateUser());
-        Assertions.assertThrows(IllegalArgumentException.class, () -> userCase2.validateUser());
-        Assertions.assertThrows(IllegalArgumentException.class, () -> userCase3.validateUser());
+        Assertions.assertThrows(IllegalArgumentException.class, () -> userCase1.validateCreateUser());
+        Assertions.assertThrows(IllegalArgumentException.class, () -> userCase2.validateCreateUser());
+        Assertions.assertThrows(IllegalArgumentException.class, () -> userCase3.validateCreateUser());
+    }
+
+    @Test
+    void 사용자의_nickName을_새로운_nick_name으로_변경한다(){
+        //given
+        User user = User.builder()
+                .userId(USER_ID)
+                .userName(USER_NAME)
+                .nickName(NICKNAME)
+                .build();
+        String newNickName = "NEW_NICK_NAME";
+
+        //when
+        user.updateNickName(newNickName);
+
+        //then
+        Assertions.assertAll(() -> {
+            Assertions.assertEquals(USER_ID, user.getUserId());
+            Assertions.assertEquals(USER_NAME, user.getUserName());
+            Assertions.assertEquals("NEW_NICK_NAME", user.getNickName());
+        });
     }
 }
diff --git a/src/test/java/com/codecrafters/companity/mock/TestDateTimeProvider.java b/src/test/java/com/codecrafters/companity/mock/TestDateTimeProvider.java
index e4b13ec..b069796 100644
--- a/src/test/java/com/codecrafters/companity/mock/TestDateTimeProvider.java
+++ b/src/test/java/com/codecrafters/companity/mock/TestDateTimeProvider.java
@@ -1,6 +1,6 @@
 package com.codecrafters.companity.mock;
 
-import com.codecrafters.companity.application.out.utility.DateTimeProvider;
+import com.codecrafters.companity.common.application.DateTimeProvider;
 import java.time.LocalDateTime;
 
 public class TestDateTimeProvider implements DateTimeProvider {
diff --git a/src/test/java/com/codecrafters/companity/mock/repository/PostInMemoryImpl.java b/src/test/java/com/codecrafters/companity/mock/repository/PostInMemoryImpl.java
index 7015e58..9684053 100644
--- a/src/test/java/com/codecrafters/companity/mock/repository/PostInMemoryImpl.java
+++ b/src/test/java/com/codecrafters/companity/mock/repository/PostInMemoryImpl.java
@@ -1,8 +1,8 @@
 package com.codecrafters.companity.mock.repository;
 
-import com.codecrafters.companity.application.out.persistence.PostRepository;
-import com.codecrafters.companity.application.out.persistence.PostCriteria;
-import com.codecrafters.companity.domain.post.Post;
+import com.codecrafters.companity.post.application.port.out.persistence.PostRepository;
+import com.codecrafters.companity.post.application.port.out.persistence.PostCriteria;
+import com.codecrafters.companity.post.domain.Post;
 
 import java.util.List;
 import java.util.Map;
diff --git a/src/test/java/com/codecrafters/companity/mock/repository/UserInMemoryImpl.java b/src/test/java/com/codecrafters/companity/mock/repository/UserInMemoryImpl.java
index b0bbfdc..a725941 100644
--- a/src/test/java/com/codecrafters/companity/mock/repository/UserInMemoryImpl.java
+++ b/src/test/java/com/codecrafters/companity/mock/repository/UserInMemoryImpl.java
@@ -1,23 +1,31 @@
 package com.codecrafters.companity.mock.repository;
 
-import com.codecrafters.companity.application.out.persistence.UserRepository;
-import com.codecrafters.companity.domain.user.User;
+import com.codecrafters.companity.common.adapter.dto.response.ResultCode;
+import com.codecrafters.companity.user.application.port.out.UserRepository;
+import com.codecrafters.companity.user.domain.User;
+import com.codecrafters.companity.exception.CustomException;
+import org.springframework.http.HttpStatus;
+
 import java.util.Map;
 import java.util.concurrent.ConcurrentHashMap;
-import java.util.concurrent.atomic.AtomicLong;
 
 public class UserInMemoryImpl implements UserRepository {
     private final Map<String, User> repository = new ConcurrentHashMap<>();
     @Override
     public User save(User user) {
-        user.setUserId(user.getUserId());
         repository.put(user.getUserId(), user);
         return user;
     }
 
     @Override
     public User getUserById(String userId) {
-        if(!repository.containsKey(userId)) throw new IllegalArgumentException();
+        if(!repository.containsKey(userId))
+            throw new CustomException(HttpStatus.BAD_REQUEST, ResultCode.USER_NOT_FOUND, "user not found. userId : " + userId);
         return repository.get(userId);
     }
+
+    @Override
+    public void deleteById(String userId) {
+        repository.remove(userId);
+    }
 }
diff --git a/src/test/java/com/codecrafters/companity/static_reference/PostStatic.java b/src/test/java/com/codecrafters/companity/static_reference/PostStatic.java
index 6d6ec69..ab179f3 100644
--- a/src/test/java/com/codecrafters/companity/static_reference/PostStatic.java
+++ b/src/test/java/com/codecrafters/companity/static_reference/PostStatic.java
@@ -1,7 +1,7 @@
 package com.codecrafters.companity.static_reference;
 
-import com.codecrafters.companity.domain.enums.City;
-import com.codecrafters.companity.domain.enums.Sport;
+import com.codecrafters.companity.post.domain.enums.City;
+import com.codecrafters.companity.post.domain.enums.Sport;
 
 public class PostStatic {
     public static final String TITLE = "Test Title";
diff --git a/src/test/java/com/codecrafters/companity/user/adapter/UserControllerTest.java b/src/test/java/com/codecrafters/companity/user/adapter/UserControllerTest.java
new file mode 100644
index 0000000..302f6cc
--- /dev/null
+++ b/src/test/java/com/codecrafters/companity/user/adapter/UserControllerTest.java
@@ -0,0 +1,15 @@
+package com.codecrafters.companity.user.adapter;
+
+import com.codecrafters.companity.user.adapter.dto.request.UserCreateRequest;
+
+public class UserControllerTest {
+
+//    private final UserUseCase userUseCase;
+
+    public void signUp (UserCreateRequest request) {
+//        User user = userUseCase.signUp(request);
+//        UserCreateResponse response = UserCreateResponse.from(user);
+
+//        return new ResponseEntity<>(response, HttpStatus.OK);
+    }
+}
diff --git a/src/test/java/com/codecrafters/companity/adapter/user/dto/response/UserCreateResponseTest.java b/src/test/java/com/codecrafters/companity/user/adapter/dto/response/UserCreateResponseTest.java
similarity index 83%
rename from src/test/java/com/codecrafters/companity/adapter/user/dto/response/UserCreateResponseTest.java
rename to src/test/java/com/codecrafters/companity/user/adapter/dto/response/UserCreateResponseTest.java
index fbd799a..f8d3a81 100644
--- a/src/test/java/com/codecrafters/companity/adapter/user/dto/response/UserCreateResponseTest.java
+++ b/src/test/java/com/codecrafters/companity/user/adapter/dto/response/UserCreateResponseTest.java
@@ -1,7 +1,7 @@
-package com.codecrafters.companity.adapter.user.dto.response;
+package com.codecrafters.companity.user.adapter.dto.response;
 
-import com.codecrafters.companity.adapter.user.dto.resposne.UserCreateResponse;
-import com.codecrafters.companity.domain.user.User;
+import com.codecrafters.companity.user.adapter.dto.resposne.UserCreateResponse;
+import com.codecrafters.companity.user.domain.User;
 import org.junit.jupiter.api.Assertions;
 import org.junit.jupiter.api.Test;