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How I Tracked Down a Race Condition in Async Python With Claude Code

This story is from 2026-10-11. It is preserved in the archive; the latest stories are on the live feed.

TL;DR A background worker in one of my Python services was sending duplicate webhooks about once every 3,000 jobs. It never happened locally, never in tests, and only sometimes in production. I used Claude Code to turn a "can't reproduce" ticket into a deterministic, 100%-failing test in one aftern…

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  1. 2026-10-11 14:31 · DEV Community — AI
    How I Tracked Down a Race Condition in Async Python With Claude Code

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