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How a Race Condition in a Shared Auth Library Was Traced Across Three Teams

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A senior full-stack developer at a large corporation encountered an intermittent authentication bug where opening an app in multiple browser tabs would cause token refresh failures, returning a 403 Forbidden error. Investigation revealed a race condition: one tab would refresh and invalidate a token while another tab simultaneously attempted to use the same token. The bug traced back to a shared frontend authentication library maintained by a separate team, though both the frontend and backend teams initially deflected responsibility. The developer compiled detailed logs, requests, and timestamps into a single ticket involving both teams, and eventually organized a cross-team meeting to reach consensus. After weeks of back-and-forth, the frontend team agreed to own the fix, though resolution remained delayed as user frustration continued to grow.

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How a Race Condition in a Shared Auth Library Was Traced Across Three Teams · ShortSingh