idempotency8 min read
Idempotency in Distributed Systems — Making Any Operation Safe to Retry
Learn idempotency key design, idempotency stores with TTL, request fingerprinting, and CQRS deduplication patterns for safe retries.
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backend6 min read
Idempotency Issues in Payment APIs — When Retries Charge Customers Twice
Network timeout on a payment request. Client retries. Customer gets charged twice. This is the most expensive bug in fintech — and it''s completely preventable with idempotency keys. Here''s the complete implementation.
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idempotency8 min read
Idempotent AI Operations — Handling Retries Without Duplicate Side Effects
Idempotent AI: idempotency keys for retries, Redis caching, replay on retry, avoiding duplicate tool calls, database upserts, and webhook deduplication.
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backend6 min read
Improper Sharding Strategy — When Your "Scalable" Database Isn't
You shard by user ID. 80% of writes go to 20% of shards because your top customers are assigned to the same shards. Or you shard by date and all writes go to the current month''s shard. Uneven distribution turns a scaling solution into a bottleneck.
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infrastructure8 min read
Testing Infrastructure as Code — Terratest, Policy-as-Code, and Shift-Left IaC
Test Terraform modules with Terratest, enforce policies with OPA/Conftest, scan with tfsec, and catch infrastructure bugs in CI before deployment.
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