diff --git a/hr/api_urls.py b/hr/api_urls.py
index de31e77..a26ef8b 100644
--- a/hr/api_urls.py
+++ b/hr/api_urls.py
@@ -8,13 +8,14 @@
 from hr.api_views import (
     EmployeeViewSet,
     PositionViewSet,
-    SalaryCalculatorView,
+    SalaryCalculatorView, DepartmentViewSet,
 )
-
+from hr.models import Department
 
 router = DefaultRouter()
 router.register(r'employees', EmployeeViewSet)
 router.register(r'positions', PositionViewSet)
+router.register(r'department', DepartmentViewSet)
 
 urlpatterns = [
     path('', include(router.urls)),
diff --git a/hr/api_views.py b/hr/api_views.py
index 2c19781..815e167 100644
--- a/hr/api_views.py
+++ b/hr/api_views.py
@@ -7,16 +7,28 @@
 from hr.calculate_salary import CalculateMonthRateSalary
 from hr.models import (
     Employee,
-    Position,
+    Position, Department,
 )
 from hr.pydantic_models import WorkingDays
 from hr.serializers import (
     EmployeeSerializer,
     PositionSerializer,
     SalarySerializer,
+    DepartmentSerializer
 )
 
 
+class DepartmentViewSet(viewsets.ModelViewSet):
+    queryset = Department.objects.all()
+    serializer_class = DepartmentSerializer
+
+    @action(detail=True, methods=['get'])
+    def employee_count(self, request, pk=None):
+        department = self.get_object()
+        count_emp = Employee.objects.filter(position__department=department).count()
+        return Response({'employee_count': count_emp})
+
+
 class EmployeeViewSet(viewsets.ModelViewSet):
     queryset = Employee.objects.all()
     serializer_class = EmployeeSerializer
diff --git a/hr/serializers.py b/hr/serializers.py
index 52e1880..a05af33 100644
--- a/hr/serializers.py
+++ b/hr/serializers.py
@@ -2,9 +2,14 @@
 
 from hr.models import (
     Employee,
-    Position,
+    Position, Department,
 )
 
+class DepartmentSerializer(serializers.ModelSerializer):
+    class Meta:
+        model = Department
+        fields = ('id', 'name', 'parent_department')
+
 
 class EmployeeSerializer(serializers.ModelSerializer):
     class Meta:
diff --git a/poetry.lock b/poetry.lock
index 5770f5a..24ba2a4 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -1,4 +1,4 @@
-# This file is automatically @generated by Poetry 1.8.2 and should not be changed by hand.
+# This file is automatically @generated by Poetry 2.1.3 and should not be changed by hand.
 
 [[package]]
 name = "annotated-types"
@@ -6,6 +6,7 @@ version = "0.6.0"
 description = "Reusable constraint types to use with typing.Annotated"
 optional = false
 python-versions = ">=3.8"
+groups = ["main"]
 files = [
     {file = "annotated_types-0.6.0-py3-none-any.whl", hash = "sha256:0641064de18ba7a25dee8f96403ebc39113d0cb953a01429249d5c7564666a43"},
     {file = "annotated_types-0.6.0.tar.gz", hash = "sha256:563339e807e53ffd9c267e99fc6d9ea23eb8443c08f112651963e24e22f84a5d"},
@@ -17,6 +18,7 @@ version = "3.7.2"
 description = "ASGI specs, helper code, and adapters"
 optional = false
 python-versions = ">=3.7"
+groups = ["main"]
 files = [
     {file = "asgiref-3.7.2-py3-none-any.whl", hash = "sha256:89b2ef2247e3b562a16eef663bc0e2e703ec6468e2fa8a5cd61cd449786d4f6e"},
     {file = "asgiref-3.7.2.tar.gz", hash = "sha256:9e0ce3aa93a819ba5b45120216b23878cf6e8525eb3848653452b4192b92afed"},
@@ -31,6 +33,7 @@ version = "4.2.6"
 description = "A high-level Python web framework that encourages rapid development and clean, pragmatic design."
 optional = false
 python-versions = ">=3.8"
+groups = ["main"]
 files = [
     {file = "Django-4.2.6-py3-none-any.whl", hash = "sha256:a64d2487cdb00ad7461434320ccc38e60af9c404773a2f95ab0093b4453a3215"},
     {file = "Django-4.2.6.tar.gz", hash = "sha256:08f41f468b63335aea0d904c5729e0250300f6a1907bf293a65499496cdbc68f"},
@@ -51,6 +54,7 @@ version = "0.18.11"
 description = "Translates Django models using a registration approach."
 optional = false
 python-versions = "*"
+groups = ["main"]
 files = [
     {file = "django-modeltranslation-0.18.11.tar.gz", hash = "sha256:a6e2c459e3b31852287d030bc6e29fa28576db97455dccd399fe08ac8e9223b9"},
     {file = "django_modeltranslation-0.18.11-py3-none-any.whl", hash = "sha256:81b68e4dc806a3b779ac88babe1cbd99d5318d374a43b3737a65fb0f4c1cffe8"},
@@ -66,6 +70,7 @@ version = "3.15.1"
 description = "Web APIs for Django, made easy."
 optional = false
 python-versions = ">=3.6"
+groups = ["main"]
 files = [
     {file = "djangorestframework-3.15.1-py3-none-any.whl", hash = "sha256:3ccc0475bce968608cf30d07fb17d8e52d1d7fc8bfe779c905463200750cbca6"},
     {file = "djangorestframework-3.15.1.tar.gz", hash = "sha256:f88fad74183dfc7144b2756d0d2ac716ea5b4c7c9840995ac3bfd8ec034333c1"},
@@ -80,6 +85,7 @@ version = "24.9.0"
 description = "Faker is a Python package that generates fake data for you."
 optional = false
 python-versions = ">=3.8"
+groups = ["main"]
 files = [
     {file = "Faker-24.9.0-py3-none-any.whl", hash = "sha256:97c7874665e8eb7b517f97bf3b59f03bf3f07513fe2c159e98b6b9ea6b9f2b3d"},
     {file = "Faker-24.9.0.tar.gz", hash = "sha256:73b1e7967b0ceeac42fc99a8c973bb49e4499cc4044d20d17ab661d5cb7eda1d"},
@@ -94,6 +100,7 @@ version = "10.3.0"
 description = "Python Imaging Library (Fork)"
 optional = false
 python-versions = ">=3.8"
+groups = ["main"]
 files = [
     {file = "pillow-10.3.0-cp310-cp310-macosx_10_10_x86_64.whl", hash = "sha256:90b9e29824800e90c84e4022dd5cc16eb2d9605ee13f05d47641eb183cd73d45"},
     {file = "pillow-10.3.0-cp310-cp310-macosx_11_0_arm64.whl", hash = "sha256:a2c405445c79c3f5a124573a051062300936b0281fee57637e706453e452746c"},
@@ -171,7 +178,7 @@ docs = ["furo", "olefile", "sphinx (>=2.4)", "sphinx-copybutton", "sphinx-inline
 fpx = ["olefile"]
 mic = ["olefile"]
 tests = ["check-manifest", "coverage", "defusedxml", "markdown2", "olefile", "packaging", "pyroma", "pytest", "pytest-cov", "pytest-timeout"]
-typing = ["typing-extensions"]
+typing = ["typing-extensions ; python_version < \"3.10\""]
 xmp = ["defusedxml"]
 
 [[package]]
@@ -180,6 +187,7 @@ version = "2.7.1"
 description = "Data validation using Python type hints"
 optional = false
 python-versions = ">=3.8"
+groups = ["main"]
 files = [
     {file = "pydantic-2.7.1-py3-none-any.whl", hash = "sha256:e029badca45266732a9a79898a15ae2e8b14840b1eabbb25844be28f0b33f3d5"},
     {file = "pydantic-2.7.1.tar.gz", hash = "sha256:e9dbb5eada8abe4d9ae5f46b9939aead650cd2b68f249bb3a8139dbe125803cc"},
@@ -199,6 +207,7 @@ version = "2.18.2"
 description = "Core functionality for Pydantic validation and serialization"
 optional = false
 python-versions = ">=3.8"
+groups = ["main"]
 files = [
     {file = "pydantic_core-2.18.2-cp310-cp310-macosx_10_12_x86_64.whl", hash = "sha256:9e08e867b306f525802df7cd16c44ff5ebbe747ff0ca6cf3fde7f36c05a59a81"},
     {file = "pydantic_core-2.18.2-cp310-cp310-macosx_11_0_arm64.whl", hash = "sha256:f0a21cbaa69900cbe1a2e7cad2aa74ac3cf21b10c3efb0fa0b80305274c0e8a2"},
@@ -290,6 +299,7 @@ version = "2.9.0.post0"
 description = "Extensions to the standard Python datetime module"
 optional = false
 python-versions = "!=3.0.*,!=3.1.*,!=3.2.*,>=2.7"
+groups = ["main"]
 files = [
     {file = "python-dateutil-2.9.0.post0.tar.gz", hash = "sha256:37dd54208da7e1cd875388217d5e00ebd4179249f90fb72437e91a35459a0ad3"},
     {file = "python_dateutil-2.9.0.post0-py2.py3-none-any.whl", hash = "sha256:a8b2bc7bffae282281c8140a97d3aa9c14da0b136dfe83f850eea9a5f7470427"},
@@ -304,6 +314,7 @@ version = "1.16.0"
 description = "Python 2 and 3 compatibility utilities"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*"
+groups = ["main"]
 files = [
     {file = "six-1.16.0-py2.py3-none-any.whl", hash = "sha256:8abb2f1d86890a2dfb989f9a77cfcfd3e47c2a354b01111771326f8aa26e0254"},
     {file = "six-1.16.0.tar.gz", hash = "sha256:1e61c37477a1626458e36f7b1d82aa5c9b094fa4802892072e49de9c60c4c926"},
@@ -315,6 +326,7 @@ version = "0.4.4"
 description = "A non-validating SQL parser."
 optional = false
 python-versions = ">=3.5"
+groups = ["main"]
 files = [
     {file = "sqlparse-0.4.4-py3-none-any.whl", hash = "sha256:5430a4fe2ac7d0f93e66f1efc6e1338a41884b7ddf2a350cedd20ccc4d9d28f3"},
     {file = "sqlparse-0.4.4.tar.gz", hash = "sha256:d446183e84b8349fa3061f0fe7f06ca94ba65b426946ffebe6e3e8295332420c"},
@@ -331,6 +343,7 @@ version = "4.11.0"
 description = "Backported and Experimental Type Hints for Python 3.8+"
 optional = false
 python-versions = ">=3.8"
+groups = ["main"]
 files = [
     {file = "typing_extensions-4.11.0-py3-none-any.whl", hash = "sha256:c1f94d72897edaf4ce775bb7558d5b79d8126906a14ea5ed1635921406c0387a"},
     {file = "typing_extensions-4.11.0.tar.gz", hash = "sha256:83f085bd5ca59c80295fc2a82ab5dac679cbe02b9f33f7d83af68e241bea51b0"},
@@ -342,12 +355,14 @@ version = "2023.3"
 description = "Provider of IANA time zone data"
 optional = false
 python-versions = ">=2"
+groups = ["main"]
+markers = "sys_platform == \"win32\""
 files = [
     {file = "tzdata-2023.3-py2.py3-none-any.whl", hash = "sha256:7e65763eef3120314099b6939b5546db7adce1e7d6f2e179e3df563c70511eda"},
     {file = "tzdata-2023.3.tar.gz", hash = "sha256:11ef1e08e54acb0d4f95bdb1be05da659673de4acbd21bf9c69e94cc5e907a3a"},
 ]
 
 [metadata]
-lock-version = "2.0"
+lock-version = "2.1"
 python-versions = "^3.11"
 content-hash = "b3627b191b7ea252a92b78b90aaf08cfb4466c204ce5a9e2f87a2fae69cf56a3"