diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..b694934
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+.venv
\ No newline at end of file
diff --git a/app.py b/app.py
new file mode 100644
index 0000000..5e9dcc5
--- /dev/null
+++ b/app.py
@@ -0,0 +1,22 @@
+from flask import Flask
+from flask_restful import Api
+from models import db
+from controller import LibraryListResource, LibraryResource
+
+app = Flask(__name__)
+api = Api(app)
+
+app.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite:///library.db'
+app.config['SQLALCHEMY_TRACK_MODIFICATIONS'] = False
+
+db.init_app(app)
+
+@app.before_request
+def create_tables():
+    db.create_all()
+
+api.add_resource(LibraryListResource, '/libraries')
+api.add_resource(LibraryResource, '/libraries/<string:isbn>')
+
+if __name__ == '__main__':
+    app.run(debug=True)
\ No newline at end of file
diff --git a/controller/__init__.py b/controller/__init__.py
new file mode 100644
index 0000000..5c80529
--- /dev/null
+++ b/controller/__init__.py
@@ -0,0 +1 @@
+from .library_controller import LibraryListResource, LibraryResource
\ No newline at end of file
diff --git a/controller/__pycache__/__init__.cpython-313.pyc b/controller/__pycache__/__init__.cpython-313.pyc
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diff --git a/controller/__pycache__/library_controller.cpython-313.pyc b/controller/__pycache__/library_controller.cpython-313.pyc
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diff --git a/controller/library_controller.py b/controller/library_controller.py
new file mode 100644
index 0000000..a8695c7
--- /dev/null
+++ b/controller/library_controller.py
@@ -0,0 +1,47 @@
+from flask_restful import Resource 
+from flask import request
+from service import LibraryService
+from models import db
+
+class LibraryListResource(Resource):
+    def get(self):
+        books = LibraryService.get_all()
+        return [book.to_dict() for book in books], 200
+
+    def post(self):
+        try:
+            data = request.get_json()
+            if 'isbn' not in data or 'title' not in data or 'author' not in data:
+                return {"message": "ISBN, title, and author are required"}, 400
+            book = LibraryService.create(data)
+            return book.to_dict(), 201
+        except Exception as e:
+            db.session.rollback()
+            return {"error": "Unexpected error occured", "details": str(e)}, 500
+
+class LibraryResource(Resource):
+    def get(self, isbn):
+        book = LibraryService.get_by_id(isbn)
+        if not book:
+            return {"message": "Book not found"}, 404
+        return book.to_dict(), 200
+
+    def put(self, isbn):
+        try:
+            data = request.get_json()
+            book = LibraryService.update(isbn, data)
+            if not book:
+                return {"message": "Book not found"}, 404
+            return book.to_dict(), 200
+        except Exception as e:
+            db.session.rollback()
+            return {"error": "Unexpected  error occured", "details": str(e)}, 500
+
+    def delete(self, isbn):
+        try: 
+            book = LibraryService.delete(isbn)
+            if not book:
+                return {"message": "Book not found"}, 404
+            return {"message": "Book deleted"}, 200
+        except Exception as e:
+            return {"error": "Unexpected error occured", "details": str(e)}, 500
diff --git a/instance/library.db b/instance/library.db
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index 0000000..8748686
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diff --git a/models/__init__.py b/models/__init__.py
new file mode 100644
index 0000000..2b42497
--- /dev/null
+++ b/models/__init__.py
@@ -0,0 +1,5 @@
+from flask_sqlalchemy import SQLAlchemy
+
+db = SQLAlchemy()
+
+from .library import Library
\ No newline at end of file
diff --git a/models/__pycache__/__init__.cpython-313.pyc b/models/__pycache__/__init__.cpython-313.pyc
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index 0000000..787f371
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diff --git a/models/__pycache__/library.cpython-313.pyc b/models/__pycache__/library.cpython-313.pyc
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diff --git a/models/library.py b/models/library.py
new file mode 100644
index 0000000..03c03f7
--- /dev/null
+++ b/models/library.py
@@ -0,0 +1,15 @@
+from . import db
+
+class Library(db.Model):
+    __tablename__ = 'libraries'
+
+    isbn = db.Column(db.String, primary_key=True)
+    title = db.Column(db.String, nullable=False)
+    author = db.Column(db.String, nullable=False)
+
+    def to_dict(self):
+        return {
+            'isbn': self.isbn,
+            'title': self.title,
+            'author': self.author
+        }
\ No newline at end of file
diff --git a/repositories/__init__.py b/repositories/__init__.py
new file mode 100644
index 0000000..ed39183
--- /dev/null
+++ b/repositories/__init__.py
@@ -0,0 +1 @@
+from .library_repositories import LibraryRepository
diff --git a/repositories/__pycache__/__init__.cpython-313.pyc b/repositories/__pycache__/__init__.cpython-313.pyc
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diff --git a/repositories/__pycache__/library_repositories.cpython-313.pyc b/repositories/__pycache__/library_repositories.cpython-313.pyc
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diff --git a/repositories/library_repositories.py b/repositories/library_repositories.py
new file mode 100644
index 0000000..22842d1
--- /dev/null
+++ b/repositories/library_repositories.py
@@ -0,0 +1,39 @@
+from models import Library, db
+
+class LibraryRepository:
+    @staticmethod
+    def find_all():
+        return Library.query.all()
+
+    @staticmethod
+    def find_by_id(isbn):
+        return Library.query.get(isbn)
+
+    @staticmethod
+    def save(book):
+        db.session.add(book)
+        db.session.commit()
+        return book
+
+    @staticmethod
+    def update(isbn, data: dict):
+        book = Library.query.get(isbn)
+        if not book:
+            return None
+
+        for key, value in data.items():
+            if hasattr(book, key):
+                setattr(book, key, value)
+
+        db.session.commit()
+        return book
+
+    @staticmethod
+    def delete(isbn):
+        book = Library.query.get(isbn)
+        if not book:
+            return None
+
+        db.session.delete(book)
+        db.session.commit()
+        return book
\ No newline at end of file
diff --git a/requirements.txt b/requirements.txt
new file mode 100644
index 0000000..d494ed6
--- /dev/null
+++ b/requirements.txt
@@ -0,0 +1,15 @@
+aniso8601==10.0.1
+blinker==1.9.0
+click==8.3.0
+Flask==3.1.2
+Flask-RESTful==0.3.10
+Flask-SQLAlchemy==3.1.1
+greenlet==3.2.4
+itsdangerous==2.2.0
+Jinja2==3.1.6
+MarkupSafe==3.0.2
+pytz==2025.2
+six==1.17.0
+SQLAlchemy==2.0.43
+typing_extensions==4.15.0
+Werkzeug==3.1.3
diff --git a/service/__init__.py b/service/__init__.py
new file mode 100644
index 0000000..f6bf3ff
--- /dev/null
+++ b/service/__init__.py
@@ -0,0 +1 @@
+from .library_service import LibraryService
\ No newline at end of file
diff --git a/service/__pycache__/__init__.cpython-313.pyc b/service/__pycache__/__init__.cpython-313.pyc
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index 0000000..f26b5a9
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diff --git a/service/__pycache__/library_service.cpython-313.pyc b/service/__pycache__/library_service.cpython-313.pyc
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index 0000000..1f57f28
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diff --git a/service/library_service.py b/service/library_service.py
new file mode 100644
index 0000000..9914d53
--- /dev/null
+++ b/service/library_service.py
@@ -0,0 +1,28 @@
+from repositories import LibraryRepository
+from models import Library
+
+class LibraryService:
+    @staticmethod
+    def get_all():
+        return LibraryRepository.find_all()
+
+    @staticmethod
+    def get_by_id(isbn):
+        return LibraryRepository.find_by_id(isbn)
+
+    @staticmethod
+    def create(data):
+        book = Library(
+            isbn=data['isbn'],
+            title=data['title'],
+            author=data['author']
+        )
+        return LibraryRepository.save(book)
+
+    @staticmethod
+    def update(isbn, data):
+        return LibraryRepository.update(isbn, data)
+
+    @staticmethod
+    def delete(isbn):  
+        return LibraryRepository.delete(isbn)
\ No newline at end of file