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Lessons (27)

• Monolith vs Microservices

  What microservices really are, what they cost, and when they're worth it. Compare monoliths, modular monoliths and …

• Deploying & Operating Microservices

  … The whole point of microservices is being able to deploy one service many times a day, safely, without …

• Data in Microservices: Sagas & the Outbox Pattern

  … each step has a compensating action to undo it](/img/microservices/saga.svg) Rule 1: database per service …

• Architecture Patterns at Scale

  Choose client-server, microservices, serverless, event-driven or peer-to-peer architecture based on ownership, failure boundaries and …

• Choosing an Architecture

  … image resizing"] K -- Rec["🏙️ Recommendation microservice<br/ (extracted: heavy ML scaling)"] Each part uses the style that …

• What Is Software Architecture?

  … inside an app (Layered, Clean, Hexagonal, Onion), the domain (DDD), and the whole system (microservices, event-driven, serverless …

• Vertical Slice Architecture & the Modular Monolith

  … Many teams that jumped straight to microservices have moved back. A modular monolith keeps the door open: when …

• Finding Service Boundaries with DDD

  The hardest part of microservices is deciding where to cut. Learn bounded contexts, ubiquitous language, aggregates and context …

• What Is Apache Kafka?

  … mermaid mindmap root((Kafka use cases)) Event-driven microservices OrderPlaced → many services react Activity tracking clicks, page views …

• REST vs GraphQL vs gRPC

  … gRPC between internal microservices, a GraphQL or BFF (Backend for Frontend) layer for their apps, and REST for …

• Kafka vs RabbitMQ & the Kafka Ecosystem

  … Pick what<br/ your team can operate well"] ✅ Kafka shines for: event-driven microservices where many services react …

• API Gateway, BFF & Service Discovery

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

• Event-Driven Architecture

  … public APIs; document them (AsyncAPI) (The Kafka and Microservices topics cover delivery guarantees, the outbox, sagas and CQRS …

• Resilience Patterns

  … The patterns below stop that.  1. Timeouts: never wait forever …

• Domain-Driven Design: Strategic Design

  … a modular monolith, and for service boundaries in microservices. One team should own each context. 4. Context mapping …

• Which Pattern Do I Need?

  … systems, which you'll meet later in the Microservices and Kafka lessons: Object-level pattern System-level cousin …

• KISS: Keep It Simple, Stupid

  … Add microservices, queues and caches when real problems show up, not before. How to practise KISS Ask yourself …

• Service Communication: Sync vs Async

  … for an answer; asynchronous messages don't](/img/microservices/sync-vs-async.svg) Synchronous: request/response One service …

• Graphs: BFS & DFS

  … The web Pages Links npm Packages "depends on" Microservices Services API calls Course plan Courses Prerequisites Types of …

• Kafka Producers

  … writing to a database and Kafka together (see Microservices → Sagas & Outbox ) Key takeaways - Producers serialise, partition (by key …

• Authentication, Authorization & API Security

  … Best for Traditional web apps APIs, mobile apps, microservices Common pattern: a short-lived access token (15 min …

• Observability: Logs, Metrics & Traces

  … Traces, the "where" In a microservice system, one click might touch 8 services. A distributed trace follows that …

• CQRS & Event Sourcing

  … a write model for commands, a read model for queries, synced by events](/img/microservices/cqrs.svg) mermaid …

• Scaling, Load Balancing & Rate Limiting

  … sick servers These are covered in depth in Microservices → Resilience Patterns . Back-of-the-envelope numbers Metric Rough …

• Database Indexing & Transactions

  … for that, see Sagas & the Outbox Pattern in the Microservices lessons. Key takeaways - Indexes turn O(n) scans …

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

  … bus, an API gateway, an orchestrator in a microservice saga. --- 5. Memento 💾 Analogy: Save points in a video …

• Domain-Driven Design: Tactical Patterns

  … the source of truth ( event sourcing , see the Microservices lessons). Factories When creating an aggregate is complex (many …