Zalando Engineers Achieve One Million RPS with Client‑Side Load Balancing

Zalando's engineering blog details a client‑side load‑balancing implementation. The system sustains traffic of one million requests per second. The approach shifts load distribution logic to the client rather than central servers. This design reduces latency and improves fault tolerance. The team leveraged open‑source tools and custom metrics for scaling. They describe handling burst traffic without over‑provisioning. The solution demonstrates a path for high‑throughput services in e‑commerce. Future work includes refining adaptive algorithms and broader deployment.