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Lessons (14)

• Releases, Observability and Production Safety

  Ship changes safely with rollout strategy, flags, migration discipline, rollback plans and observable service-level outcomes. ![Safe release …

• Behavioral Patterns I: Observer, Strategy, Command, State

  … In State the object switches itself as its state changes. --- Cheat sheet Pattern One-liner Everyday example --- --- --- Observer …

• Observability: Logs, Metrics & Traces

  When production breaks at 3 a.m., observability tells you what, where and why. Learn the three pillars …

• Which Pattern Do I Need?

  … Builder creates step by step . Observer vs Mediator Observer broadcasts one-to-many. Mediator coordinates many-to-many …

• What Are Design Patterns?

  … proven solutions with names, so developers can say "let's use an Observer here" instead of explaining 50 …

• Architecture Patterns at Scale

  … Serverless Bursty event-driven work Cold starts, limits, observability Event-driven Decoupled side effects Ordering, replay, eventual consistency …

• System Design Interview Framework

  … 7. Close with failure modes, observability, cost and evolution. State assumptions aloud. Keep the first design simple, name …

• Real-Time, Pub/Sub, Webhooks and CDC

  Choose the right push or event mechanism and keep event delivery observable, idempotent and replayable. ![Event patterns: an …

• Time, Consistency and Distributed Transactions

  … clocks order observations, fencing protects ownership, and sagas compensate cross-service work](/img/system-design-l6/time-transactions …

• Deploying & Operating Microservices

  … latency, traffic, errors, saturation. - Correlate everything in one place (Grafana, Datadog, Honeycomb). (See Backend → Observability for the details …

• MVC, MVP & MVVM

  … Model–View–ViewModel The ViewModel exposes observable state and commands . The View binds to them, so when the …

• Why Kubernetes?

  … API[Kubernetes API] API -- Loop{{"🔁 Control loop<br/ observe → compare → act"}} Loop -- "actual: 2 running<br/ desired: 3 …

• API Gateway, BFF & Service Discovery

  … outside, gRPC inside Caching Cache public GET responses Observability Access logs, metrics, start a trace ID Canary routing …

• Serverless Architecture

  … Harder; use emulators (SAM, LocalStack) and good tracing Observability Many small pieces: invest in structured logs, tracing (X …