Wix transitioned from a monolithic architecture to microservices to improve scalability, availability, and performance. The system was split into the Editor, Media, and Public segments. The Editor segment uses active-standby MySQL replication across data centers to provide high availability for editing websites. The Media segment is a distributed file system running on cloud infrastructure. The Public segment uses load balancers, caching, and database normalization to render websites with sub-100ms response times for millions of users. Redundancy and fallback strategies ensure segments can tolerate failures to meet strict 99.999% availability SLAs.