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Understanding outbox, saga, cache-aside, idempotency, and CQRS patterns Five backend system design patterns are explained through one running e-commerce order example: the Outbox pattern for reliably publishing events alongside database writes, the Saga pattern for coordinating multi-service transactions with compensating actions, Cache-Aside for keeping catalog reads fast without serving stale data, Idempotency keys for safely handling retried requests (including a race-condition fix using Redis SET NX), and CQRS for splitting write and read models when their shapes diverge. The piece closes by showing how all five combine in a real checkout flow and why each exists to answer what happens when a specific component fails mid-operation. READ MORE