Cloud Architecture

Sep 24, 2026 · Backend Development

Scaling Spring Boot Sign-In to 100M Users: Distributed Architecture Evolution & Production Hardening

This article details the evolution of a Spring Boot daily sign-in system from 10K to 100M users, covering Redis bitmap sharding, Lua atomic operations, command outbox pattern, Kafka async reward processing, idempotency guarantees, fault tolerance strategies, and production-grade observability with real incident postmortems.