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Lessons (12)

• Design a Logging and Monitoring Platform

  Ingest high-volume telemetry reliably, separate hot search from cheap retention, and make alerting useful rather than noisy …

• Design a Social Media Feed

  … is not acceptable to lose the original post. Monitor fan-out lag, feed freshness, cache hit rate and …

• Networking, DNS and Traffic Routing

  … by host/path, terminate TLS and apply policies. Monitor DNS TTL/propagation, edge health, connection errors, regional latency …

• Replication, Partitioning & Sharding

  … or a product experience that explicitly accepts delay. Monitor replica lag and promote only a safe, current replica …

• What Is Apache Kafka?

  … everything talks to everything"] A1[Web app] -- D1[(DB)] & S1[Search] & AN1[Analytics] & M1[Monitoring] A2[Mobile API …

• Monolith vs Microservices

  … CI/CD, monitoring, tracing, orchestration The hidden costs ("the distributed systems tax") The 8 fallacies of distributed computing …

• ACID, Transactions & Locks

  … Keep transactions short, access tables in a consistent order, avoid network calls inside them, and monitor lock-wait …

• Consumers & Consumer Groups

  … with error details in headers, then move on. - Monitor the DLT and replay messages after fixing the bug …

• Deployments, ReplicaSets & Rollouts

  … log collectors, monitoring agents, CNI Adds a pod when a node joins Job Run to completion once: migrations …

• REST API Design

  … Clients, caches and monitoring tools all rely on the status code. Rule 3: Consistent error format Pick one …

• Serverless Architecture

  … capacity ahead ✅ Scales automatically Ops work Patching, scaling, monitoring hosts ✅ The provider handles it Cost at constant high …

• Hexagonal Architecture (Ports & Adapters)

  … The console doesn't care whether you plug in a 4K TV or an old monitor, a wired …