Engineering notes from product engineer Geomseong Ahn

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Why I rolled back refresh token rotation after one day Sep 4, 2026

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Keeping call audio alive in the background by registering in-app calls with the OS
Managing server env files with GitHub Environment Secrets and Kamal, hiding values but keeping failure reasons
Measuring and cutting monorepo deploy time, from a 35-minute full backend deploy to 13
Zero-downtime deploys on an on-prem server with Kamal
Roles changed, but the old ones kept working for 30 minutes: putting a permission version in the JWT

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