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Lessons (4)

• Proxies, APIs and Real-Time Protocols

  Pick REST, RPC, queues, long polling, WebSockets, TCP or UDP based on the interaction shape. ![Communication choices: reverse …

• Design a Chat Application

  … offline notifications. ![Chat separates durable conversation storage from WebSocket fan-out, presence and offline push paths](/img/system …

• REST vs GraphQL vs gRPC

  … caching ✅ Easy (GET + CDN) ❌ Harder ❌ No Streaming SSE / WebSockets separately Subscriptions ✅ Built in Browser support ✅ Native ✅ Native ⚠️ Needs …

• Serverless Architecture

  … workloads, long-running or stateful processes (game servers, WebSocket-heavy apps), ultra-low-latency paths where cold starts …