How Vercel Migrated Its Core Database Handling 6,000 Deployments Per Minute
evilrabbit_ · x · 2026-08-12
Vercel's engineering team detailed how they migrated the database behind every platform build from Redis to DynamoDB, handling up to 6,000 deployments per minute.
Context:
The build warm pool state—tracking container readiness, authentication tokens, and billing mappings—was originally stored in Redis. As the platform grew, keeping critical, non-recoverable state like billing mappings in an ephemeral cache became a liability.
Strategy:
Because containers continuously spin up and expire 24/7, the team couldn't pause the system. They executed the migration live under production traffic, moving through phases controlled by feature flags with rollback readiness.
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