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How One Team Fixed a Recurring Auth Bug by Centralizing JWT Validation

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A software team repeatedly patched the same authentication bug across three separate services before realizing the root cause was three independent JWT validation implementations, each with slightly different logic. Tokens issued at permission-change boundaries would pass validation in one service but fail in another due to inconsistent revocation-check timing, causing customers to appear logged in on one endpoint and unauthorized on the next. Rather than maintaining a shared library — which risked being forked or patched inconsistently — the team moved authentication to a dedicated API gateway that handles validation before requests reach any application code. A five-week migration included a shadow mode phase, where the gateway logged decisions without enforcing them, allowing engineers to identify and resolve discrepancies against existing service behavior before any live cutover. The team acknowledged a new trade-off: centralizing auth also centralizes its failure mode, which they mitigated with independent scaling, a separate error budget, and a fail-open circuit breaker.

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