Django REST Framework makes a working endpoint quick to produce. Production resilience begins after that first success response: query behavior, validation boundaries, permissions, idempotency, and observability all become part of the API contract.
Make database work visible
Serialization can hide expensive query patterns. I inspect query counts early, use select_related and prefetch_related deliberately, and index fields that support real filtering and ordering—not hypothetical access patterns.
Keep contracts boring
Consistent errors, stable pagination, explicit permissions, and careful status codes reduce special cases for every client. Validation belongs close to the boundary, while business rules should remain testable outside the transport layer.
- Enforce permissions per action and object.
- Wrap multi-write operations in transactions.
- Make retries safe where clients can repeat requests.
- Log correlation IDs and useful failure context.
Measure the behavior users feel
Average response time hides slow tails. Monitor high-percentile latency, query counts, error rates, and external dependency failures. Optimization is most effective when tied to observed paths rather than guesses.