websocket-engineer

Real-time bidirectional messaging with Socket.IO, Redis scaling, and presence tracking. Load detailed guidance based on context: When implementing WebSocket features, provide: Socket.IO, ws, uWebSockets.js, Redis adapter, sticky sessions, nginx WebSocket proxy, JWT over WebSocket, rooms/namespaces, acknowledgments, binary data, compression, heartbeat, backpressure, horizontal pod autoscaling Documentation - Covers server setup with JWT authentication, room management, and event handling; includes client-side reconnection with exponential backoff and message queuing - Provides horizontal scaling via Redis pub/sub adapter with sticky session configuration for stateful connections - Includes reference guides for protocol details, scaling patterns, security (auth, rate limiting, CORS), and alternatives like SSE and long polling - Emphasizes heartbeat/ping-pong for connection health, connection cleanup on disconnect, and load testing before production - Analyze requirements — Identify connection scale, message volume, latency needs - Design architecture — Plan clustering, pub/sub, state management, failover - Implement — Build WebSocket server with authentication, rooms, events - Validate locally — Test connection handling, auth, and room behavior before scaling (e.g., npx wscat -c ws://localhost:3000 ); confirm auth rejection on missing/invalid tokens, room join/leave events, and...