Amazon Cognito modernizes infrastructure for scale
🔒 Amazon Cognito migrated hundreds of millions of user profiles to a next-generation storage infrastructure to enable higher throughput, customer-managed encryption keys, and multi-Region replication while preserving backward compatibility and zero downtime. The architecture focuses on identity-first design, independent datasets, and reversible changes to support rapid feature iteration. Migration used shadow mode, dual-write, data backfill, anti-entropy validation, and incremental rollouts with rollback to ensure data integrity and preserve application behavior.
