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Lessons (6)

• Design a Chat Application

  Deliver live messages without losing them by separating durable messages from fan-out, presence and offline notifications. ![Chat …

• Proxies, APIs and Real-Time Protocols

  … updates Long polling Repeated connections Live two-way chat WebSocket Connection lifecycle/fan-out Ordered reliable bytes TCP …

• Service Communication: Sync vs Async

  … All covered in Resilience Patterns . Avoid chatty services mermaid flowchart LR subgraph Chatty["❌ Chatty: N+1 over the …

• Behavioral Patterns II: Chain, Template, Iterator, Mediator, Memento, Visitor

  … T end js // A chat room is a mediator between users class ChatRoom { members = new Map(); join(user …

• Finding Service Boundaries with DDD

  … 4. Check the chattiness: if two services call each other for every request, they're probably one context …

• Caching & Redis

  … groups Pub/Sub PUBLISH , SUBSCRIBE Real-time notifications, chat js // Leaderboard in 3 commands await redis.zAdd("leaderboard …