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Original rewrites on React, Node.js, TypeScript and AI — practical notes from the same engineering practice behind our operator software. Article bodies are in English.
Tagged: idempotency
Refund Agents: LangGraph Survived Where CrewAI and AutoGen Broke
Same tools and policy across three frameworks—only explicit state, idempotency, and checkpoints survived chaos kills.
2754 wordsRead article12 Rules of Thumb for Reliable Node.js APIs
Practical Node.js API reliability rules: timeouts, idempotency, transactions, cache invalidation, logging, and dependency latency—before the 3 a.m. page.
906 wordsRead articleDesigning a Duplicate-Free Notification Pipeline on SQS, SES and Redis
How a two-queue SQS design, an SES-to-SendGrid fallback and an atomic Redis lock keep business documents flowing to recipients exactly once, even under load.
1509 wordsRead articleWhy NestJS @Cron Jobs Run Once per Replica and How to Fix It
Learn why in-process @Cron schedules multiply when a NestJS service scales out, and how an external trigger, idempotent writes and a guarded endpoint fix it.
1350 wordsRead articleFrom "Go Ahead" to Done: State, Approval and Idempotency for Acting Agents
Learn how explicit proposals, bound approvals, revalidation, idempotency keys and outcome verification turn a multi-agent refund workflow into one you can trust.
3113 wordsRead articleUnderstanding Idempotency Keys in Node.js POST Endpoints
Explains why POST requests fail unpredictably on retry and how client-generated idempotency keys let Node.js APIs safely handle duplicate requests.
1390 wordsRead article
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