websocket-engineer
Real-time bidirectional messaging with Socket.IO, Redis scaling, and presence tracking.
- 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
WebSocket Engineer
Core Workflow
- 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 message delivery - Scale — Verify Redis connection and pub/sub round-trip before enabling the adapter; configure sticky sessions and confirm with test connections across multiple instances; set up load balancing
- Monitor — Track connections, latency, throughput, error rates; add alerts for connection-count spikes and error-rate thresholds
Reference Guide
Load detailed guidance based on context:
| Topic | Reference | Load When |
|---|---|---|
| Protocol | references/protocol.md |
WebSocket handshake, frames, ping/pong, close codes |
| Scaling | references/scaling.md |
Horizontal scaling, Redis pub/sub, sticky sessions |
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