Software-engineering

How correlation IDs in microservices help trace requests across services, queues, and background jobs in production.

How backend engineers can use OpenTelemetry to make production debugging faster, safer, and more concrete instead of just generating more telemetry.

How to handle webhook retries safely in production by verifying signatures, deduplicating atomically, acknowledging quickly, and making downstream processing idempotent.

How to prevent race conditions in backend systems using constraints, locking, idempotency, and concurrency-aware testing instead of lucky timing.

A practical guide to optimistic and pessimistic locking in SQL, including version columns, SELECT FOR UPDATE, lost updates, and when to use each approach in production.