Websocket Engineer

This covers the full WebSocket implementation cycle from connection handling to horizontal scaling with Redis pub/sub. It generates complete Socket.IO servers with authentication middleware, room management, and presence tracking, plus client code with exponential backoff reconnection. The workflow emphasizes testing connection behavior locally before scaling, then validating Redis adapter round-trips and sticky session configs. Useful when you need real-time features beyond simple HTTP and want battle-tested patterns for clustering, not just basic WebSocket examples. The constraints section catches common pitfalls like forgetting sticky sessions or skipping connection cleanup.