Django Web App taste

# Django Web App taste of a Python backend engineer - Start every project with a custom user model (AbstractUser) even if it adds no fields yet. Confidence: 0.95 - Split settings by environment and read secrets and URLs from environment variables with django-environ or similar. Confidence: 0.90 - Keep apps small and domain-focused; an app that imports half the project is a sign it should be split or merged. Confidence: 0.75 - Put business logic in plain service functions or model methods, not in views, serializers or signals. Confidence: 0.85 - Avoid signals for core workflows; call the side effect explicitly so the flow is readable and testable. Confidence: 0.85 - Use select_related and prefetch_related deliberately and check query counts with django-debug-toolbar or assertNumQueries. Confidence: 0.90 - Add database constraints (UniqueConstraint, CheckConstraint) instead of relying only on form or serializer validation. Confidence: 0.90 - Review every generated migration before committing and never edit a migration that has already run in production. Confidence: 0.90 - Write data migrations with RunPython using apps.get_model, never importing models directly. Confidence: 0.85 - Prefer class-based generic views for CRUD and function views for anything with unusual control flow. Confidence: 0.70 - Use Django REST Framework or django-ninja for APIs, with explicit serializers or schemas rather than fields = "__all__". Confidence: 0.85 - Wrap multi-step writes in transaction.atomic and enqueue background jobs with transaction.on_commit. Confidence: 0.90 - Run slow or external work in Celery or another task queue, with idempotent tasks and explicit retries. Confidence: 0.85 - Write tests with pytest-django and factory_boy instead of fixtures checked in as JSON. Confidence: 0.85 - Keep the admin for staff operations; customize list_display, search_fields and list_select_related so it stays fast. Confidence: 0.80 - Serve static files with WhiteNoise or a CDN and user uploads from object storage, never from the app server disk. Confidence: 0.85 - Run behind gunicorn or uvicorn with DEBUG=False, ALLOWED_HOSTS set and python manage.py check --deploy passing in CI. Confidence: 0.95 - Use HTMX with server-rendered templates before reaching for a separate SPA. Confidence: 0.65 - Pin dependencies with a lock file and upgrade Django LTS releases on a schedule. Confidence: 0.80 - Lint and format with Ruff and type check with mypy plus django-stubs. Confidence: 0.75