A production-focused technical reference for backend engineers, SREs, and fintech architects. Covers idempotency key design, Redis & PostgreSQL deduplication patterns, distributed locking primitives, exactly-once processing guarantees, and the observability to prove it all works — everything you need to prevent duplicate charges and cascading failures in distributed systems.
The mathematical contract behind idempotency: HTTP method safety, idempotency key lifecycles, retry-safe exponential backoff, and webhook delivery guarantees. Essential reading before touching any payment or mutation API.
Explore sectionProduction-tested storage recipes: Redis SETNX deduplication, PostgreSQL unique constraints, atomic transaction scoping, and TTL lifecycle management — all tuned for high-throughput APIs without sacrificing correctness.
Explore sectionAdvanced coordination primitives for multi-node deduplication: Redlock, consensus algorithms, lease-based lock management, and battle-tested approaches to prevent race conditions and thundering herd in high-concurrency microservices.
Explore sectionProve your deduplication layer works in production: idempotency hit-rate metrics and dashboards, distributed tracing of duplicate suppression with OpenTelemetry, and chaos-engineering experiments that inject duplicates, clock skew, and lock loss before your customers do.
Explore section