diff --git a/join/settings.py b/join/settings.py
index 9b6ce98..4f318dc 100644
--- a/join/settings.py
+++ b/join/settings.py
@@ -38,6 +38,7 @@ INSTALLED_APPS = [
     'django.contrib.messages',
     'django.contrib.staticfiles',
     'rest_framework',
+    'task_app',
 ]
 
 MIDDLEWARE = [
diff --git a/join/urls.py b/join/urls.py
index c573bb7..52248cc 100644
--- a/join/urls.py
+++ b/join/urls.py
@@ -1,22 +1,14 @@
-"""
-URL configuration for join project.
-
-The `urlpatterns` list routes URLs to views. For more information please see:
-    https://docs.djangoproject.com/en/5.1/topics/http/urls/
-Examples:
-Function views
-    1. Add an import:  from my_app import views
-    2. Add a URL to urlpatterns:  path('', views.home, name='home')
-Class-based views
-    1. Add an import:  from other_app.views import Home
-    2. Add a URL to urlpatterns:  path('', Home.as_view(), name='home')
-Including another URLconf
-    1. Import the include() function: from django.urls import include, path
-    2. Add a URL to urlpatterns:  path('blog/', include('blog.urls'))
-"""
 from django.contrib import admin
-from django.urls import path
+from django.urls import path, include
+from rest_framework.routers import DefaultRouter
+from task_app.views import TaskViewSet, SubTaskViewSet, AssignedTaskViewSet
+
+router = DefaultRouter()
+router.register(r'tasks', TaskViewSet)
+router.register(r'subtasks', SubTaskViewSet)
+router.register(r'assigned_tasks', AssignedTaskViewSet)
 
 urlpatterns = [
     path('admin/', admin.site.urls),
-]
+    path('api/', include(router.urls)),
+]
\ No newline at end of file
diff --git a/task_app/admin.py b/task_app/admin.py
index 8c38f3f..6571c08 100644
--- a/task_app/admin.py
+++ b/task_app/admin.py
@@ -1,3 +1,17 @@
 from django.contrib import admin
+from .models import Task, SubTask, AssignedTask
 
-# Register your models here.
+class SubTaskInline(admin.TabularInline):
+    model = SubTask
+    extra = 1
+
+class AssignedTaskInline(admin.TabularInline):
+    model = AssignedTask
+    extra = 1 
+
+@admin.register(Task)
+class TaskAdmin(admin.ModelAdmin):
+    list_display = ('title', 'category', 'status', 'priority', 'creator', 'date')
+    search_fields = ('title', 'category', 'creator__username')
+    list_filter = ('status', 'priority', 'date')
+    inlines = [SubTaskInline, AssignedTaskInline]
\ No newline at end of file
diff --git a/task_app/models.py b/task_app/models.py
index 71a8362..8ba579f 100644
--- a/task_app/models.py
+++ b/task_app/models.py
@@ -1,3 +1,35 @@
 from django.db import models
+from django.contrib.auth import get_user_model
 
-# Create your models here.
+User = get_user_model()
+
+class Task(models.Model):
+    title = models.CharField(max_length=255)
+    description = models.TextField(blank=True, null=True)
+    category = models.CharField(max_length=50, choices=[('technical_task', 'Technical Task'), ('user_story', 'User Story')])
+    priority = models.CharField(max_length=50, choices=[('low', 'Low'), ('medium', 'Medium'), ('urgent', 'Urgent')])
+    status = models.CharField(max_length=50, choices=[('todo', 'Todo'), ('in_progress', 'In Progress'), ('await_feedback', 'Await feedback'), ('done', 'Done')])
+    date = models.DateField()
+    
+    creator = models.ForeignKey(User, related_name="created_tasks", on_delete=models.CASCADE)
+    created_at = models.DateTimeField(auto_now_add=True)
+
+    def __str__(self):
+        return self.title
+
+
+class SubTask(models.Model):
+    task = models.ForeignKey(Task, related_name="subtasks", on_delete=models.CASCADE)
+    title = models.CharField(max_length=255)
+    done = models.BooleanField(default=False)
+
+    def __str__(self):
+        return f"{self.task.title} - {self.title}"
+
+
+class AssignedTask(models.Model):
+    task = models.ForeignKey(Task, related_name="assigned_users", on_delete=models.CASCADE)
+    user = models.ForeignKey(User, related_name="assigned_tasks", on_delete=models.CASCADE)
+
+    def __str__(self):
+        return f"{self.user.username} assigned to {self.task.title}"
\ No newline at end of file
diff --git a/task_app/serializers.py b/task_app/serializers.py
new file mode 100644
index 0000000..3420599
--- /dev/null
+++ b/task_app/serializers.py
@@ -0,0 +1,25 @@
+from rest_framework import serializers
+from django.contrib.auth import get_user_model
+from .models import Task, SubTask, AssignedTask
+
+User = get_user_model()
+
+class SubTaskSerializer(serializers.ModelSerializer):
+    class Meta:
+        model = SubTask
+        fields = '__all__'
+
+class AssignedTaskSerializer(serializers.ModelSerializer):
+    user = serializers.StringRelatedField()  # Gibt den Usernamen zurück, anstatt der ID
+
+    class Meta:
+        model = AssignedTask
+        fields = '__all__'
+
+class TaskSerializer(serializers.ModelSerializer):
+    subtasks = SubTaskSerializer(many=True, read_only=True)
+    assigned_users = AssignedTaskSerializer(many=True, read_only=True)
+
+    class Meta:
+        model = Task
+        fields = '__all__'
\ No newline at end of file
diff --git a/task_app/views.py b/task_app/views.py
index 91ea44a..f658782 100644
--- a/task_app/views.py
+++ b/task_app/views.py
@@ -1,3 +1,15 @@
-from django.shortcuts import render
+from rest_framework import viewsets
+from .models import Task, SubTask, AssignedTask
+from .serializers import TaskSerializer, SubTaskSerializer, AssignedTaskSerializer
 
-# Create your views here.
+class TaskViewSet(viewsets.ModelViewSet):
+    queryset = Task.objects.all()
+    serializer_class = TaskSerializer
+
+class SubTaskViewSet(viewsets.ModelViewSet):
+    queryset = SubTask.objects.all()
+    serializer_class = SubTaskSerializer
+
+class AssignedTaskViewSet(viewsets.ModelViewSet):
+    queryset = AssignedTask.objects.all()
+    serializer_class = AssignedTaskSerializer
\ No newline at end of file