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Lessons (20)

• API Contracts, Gateways and Security

  Make APIs evolvable and safe with explicit formats, versioning, idempotency, gateway policy, authentication and authorization. ![API boundary: a …

• API Gateway, BFF & Service Discovery

  … one front door for many services](/img/microservices/api-gateway.svg) Without vs with a gateway mermaid flowchart …

• Services & Ingress

  … Ingress, evolved The newer Gateway API splits responsibilities between roles and supports more features (header matching, traffic splitting …

• Design a Chat Application

  … Offline push comes from the durable event, not an in-memory gateway.

• Design a Logging and Monitoring Platform

  … logs, metrics and traces to an authenticated ingestion gateway. A durable stream absorbs bursts; processors index a bounded …

• Resilience Patterns

  … Without it, one slow service causes a cascading failure : mermaid flowchart LR U[👥 Users] -- G[Gateway] -- O[Orders …

• Timeouts, Retries & Backpressure

  … Do not give every hop its own 1,000 ms timeout. Step Budget When it expires --- ---: --- Gateway/app …

• Which Pattern Do I Need?

  … Sub, Kafka topics, event-driven architecture Facade API Gateway, Backend for Frontend Proxy Reverse proxy, CDN, service mesh …

• How a Web Request Works

  … failed 500 Internal Error, 502 Bad Gateway, 503 Unavailable, 504 Gateway Timeout 5. Your server code Inside the …

• Serverless Architecture

  … mermaid flowchart LR H["🌐 HTTP request<br/ (API Gateway)"] -- F1["λ createOrder"] S3["🖼️ File uploaded<br/ (S3 …

• Onion Architecture & Clean vs Hexagonal vs Onion

  … Repository / service interface in domain services Output port / gateway interface Interface the core offers Driving (primary) port Application …

• Observability: Logs, Metrics & Traces

  … GET /checkout (total 820 ms) dateFormat x axisFormat %L section api-gateway gateway :0, 820 section orders-svc …

• KISS: Keep It Simple, Stupid

  … 3 users, day one"] direction LR GW[API Gateway] -- MS1[User service] & MS2[Auth service] & MS3[Profile service …

• Clean Architecture

  … interfaces they need │ └── RegisterUser.js ├── adapters/ controllers, repositories, gateways │ ├── UserController.js │ └── PostgresUserRepository.js └── main.js composition root: wires …

• Monolith vs Microservices

  … many deployables"] direction LR GW[API Gateway] -- US[Users svc] -- UDB[(users DB)] GW -- OS[Orders svc] -- ODB …

• Deploying & Operating Microservices

  … across all of them. mermaid flowchart LR G["Gateway<br/ traceId=abc"] -- O["Orders<br/ traceId=abc"] -- P …

• Data in Microservices: Sagas & the Outbox Pattern

  … Options: Approach How Trade-off --- --- --- API composition A BFF/gateway calls each service and joins in memory Simple …

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

  … store between components, an event bus, an API gateway, an orchestrator in a microservice saga. --- 5. Memento 💾 Analogy …

• Structural Patterns: How to Connect Objects

  … balance = 50 ✅ You've used it: Vue 3 reactivity (built on Proxy ), MobX, API gateways, CDNs (a caching …

• Clean Architecture in Depth

  … one class per user action The application's behaviour changes Entities + port interfaces 🔵 Interface adapters Controllers, presenters, gateways …