https://www.rambling-me.com/blog A blog to reflect my thoughts, learnings, and observations en-us me@rambling-me.com (Dopeking) me@rambling-me.com (Dopeking) Mon, 10 Aug 2026 00:00:00 GMT https://www.rambling-me.com/blog/posts/technology/scaling/api-backend/4-correctness-in-an-async-world https://www.rambling-me.com/blog/posts/technology/scaling/api-backend/4-correctness-in-an-async-world The hard part nobody warns you about. Once you go asynchronous and at-least-once, duplicates, retries, partial failures, and the dual-write problem all become your problem. The toolkit: idempotency as the foundation, retries with dead-letter queues, the outbox pattern for atomic publish, and sagas for multi-step flows like payment. Where a bank and a food app draw the line differently. Mon, 10 Aug 2026 00:00:00 GMT me@rambling-me.com (Dopeking) technologyscalingapi-backendidempotencyoutboxsagadead-letter-queuepractitioner