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Developer Used Claude Code to Catch a Race Condition Bug Before Shipping SaaS Billing

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A developer building a SaaS product changed their definition of 'done' by requiring an AI coding agent, Claude Code, to prove billing worked end-to-end against real infrastructure before shipping. Claude Code provisioned a live staging environment on Render, configured a Paddle sandbox webhook, and simulated a real customer purchase flow to verify the full money path. During this process, a race condition was uncovered in the webhook handling logic, where two Paddle events — subscription.created and subscription.activated — could arrive simultaneously, both attempting to insert the same subscription row into the database. While the database's unique constraint prevented duplicate records, it caused one webhook handler to fail, a flaw that existing unit and idempotency tests had not caught. The incident highlighted that testing individual operations thoroughly is not enough if the sequencing assumptions connecting those operations go unchallenged.

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