Django REST Framework

How do DRF requests, parsers, responses, and renderers work together?

Explains how DRF turns an HTTP representation into request data and selects a response representation.

How do DRF serializers cause N+1 queries, and how do you prevent them?

Traces serializer relation access back to queryset loading and verifies the fix with query evidence.

How do you choose between APIView, generic views, mixins, and ViewSets?

Chooses the smallest DRF view abstraction that expresses an endpoint clearly.

How would you implement a consistent API error contract in DRF?

Maps DRF and application failures into stable client errors while preserving internal diagnostic evidence.

How would you implement a writable nested serializer safely?

Makes nested create and update semantics, authorization, identity, and transaction ownership explicit.

In what order does DRF process authentication, permissions, throttling, negotiation, and the handler?

Builds a useful DRF lifecycle model for policy checks, handler execution, exception conversion, and rendering.

Python Backend

Python backend interview preparation grounded in real service development.

A backend-focused Python preparation path covering language semantics, typing, FastAPI, Django, concurrency, data access, testing, security, background work, reliability, and production diagnosis.