Django Service Layer Architecture

Enforces service layer patterns in Django/DRF projects with ALL business logic in services, NOT views. Auto-activates on: service, business logic, viewset, delegation, static method. Prevents logic in views/serializers, static methods with state, god classes. Ensures testability with dependency injection, type hints, single responsibility. Validates service methods have type hints, ViewSets delegate (max 10 lines/method), services are stateless. Targets: 100% service delegation, 0 business logic in views, stateless services.