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Lessons (28)

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

  … an event stream can feed pub-sub consumers, webhook delivery, server-sent updates and database change capture](/img …

• Vertical Slice Architecture & the Modular Monolith

  … public interfaces. mermaid flowchart TB subgraph App["🏢 One deployable application"] direction LR subgraph M1["📦 Ordering module"] O1[public …

• Event-Driven Architecture

  … Write model publishes; read model projects Fast, tailored reads; eventual consistency mermaid flowchart LR subgraph N["Event notification …

• Data in Microservices: Sagas & the Outbox Pattern

  … A separate relay process reads the outbox and publishes to the broker. mermaid flowchart LR subgraph Tx["One …

• Service Communication: Sync vs Async

  … one or many subscribers Coupling The sender knows who does the work The publisher doesn't know who …

• Message Queues & RabbitMQ

  … Only one worker should do it. - Pub/Sub: "a user signed up". Email, analytics and CRM all want …

• Monolith vs Microservices

  … Modules talk only through public interfaces, never by reaching into each other's tables. mermaid flowchart TB subgraph …

• REST vs GraphQL vs gRPC

  … See how each works, compare them side by side, and learn which to pick for public APIs, mobile …

• Kafka vs RabbitMQ & the Kafka Ecosystem

  … db", "database.dbname": "orders", "table.include.list": "public.orders,public.outbox", "topic.prefix": "shop" } } Change Data Capture (CDC …

• Domain-Driven Design: Tactical Patterns

  … load → call domain → save → publish PlaceOrderHandler Domain event Something that happened in the domain OrderPlaced , OrderShipped Factory Encapsulates …

• Onion Architecture & Clean vs Hexagonal vs Onion

  … postgres, stripe (Hexagonal adapters) How these relate to Layered architecture mermaid flowchart TB subgraph L["Layered: dependencies point …

• Caching & Redis

  … XADD , XREADGROUP Event log with consumer groups Pub/Sub PUBLISH , SUBSCRIBE Real-time notifications, chat js // Leaderboard in …

• Domain-Driven Design: Strategic Design

  … Domains and subdomains, ubiquitous language, bounded contexts, all the context-mapping patterns, and event storming to discover them …

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

  … Observer (Pub/Sub) 📰 Analogy: A YouTube channel. You subscribe once; every new video, you get notified. The channel …

• API Gateway, BFF & Service Discovery

  … Hard-coding 10.0.3.17:8080 doesn't work. mermaid flowchart LR subgraph Registry["📒 Service registry"] R …

• SOLID at a Glance

  … injected abstractions this.repository = repository; this.notifier = notifier; } async publish(report, exporter) { const file = exporter.export(report); // L …

• What Are Design Patterns?

  … one change"] P -- S["💡 Solution<br/ subscribers register;<br/ the subject notifies them"] S -- C["⚖️ Consequences<br/ loose …

• YAGNI: You Aren't Gonna Need It

  … and using 10% of it. mermaid flowchart LR subgraph Pack["🧳 Packing 'just in case'"] A[Snow boots …

• Which Pattern Do I Need?

  … lessons: Object-level pattern System-level cousin --- --- Observer Pub/Sub, Kafka topics, event-driven architecture Facade API Gateway …

• What Is Apache Kafka?

  … point connections had become spaghetti: mermaid flowchart LR subgraph Before["❌ Before: everything talks to everything"] A1[Web app …

• Microkernel (Plugin) Architecture

  … The phone maker doesn't rebuild the OS for each new app; apps plug in through a published …

• REST API Design

  … true } } mermaid flowchart LR subgraph Offset["OFFSET 100000 LIMIT 20"] o["DB reads and throws away<br/ 100 …

• Services & Ingress

  … gone after restart" P1[pod] end subgraph With["✅ Through a Service"] C2[checkout] -- "http://shop-api" S{{"Service …

• Finding Service Boundaries with DDD

  … mermaid flowchart TB subgraph Catalog["📚 Catalog context"] CP["Product<br/ name, images, description"] end subgraph Ordering["🛒 Ordering …

• CQRS & Event Sourcing

  … balance = 120"] end subgraph ES["Event sourced"] E1["1. AccountOpened"] -- E2["2. MoneyDeposited $100"] -- E3["3. MoneyWithdrawn $30 …

• Helm, kubectl Cheat Sheet & Best Practices

  … team-shop } subjects: [{ kind: Group, name: shop-developers }] roleRef: { kind: Role, name: read-pods, apiGroup: rbac.authorization.k8s …

• Frontend Performance & Core Web Vitals

  … stop things jumping mermaid flowchart LR subgraph Before["❌ Image loads without reserved space"] B1["Headline<br/ [Buy button …

• Choosing an Architecture

  … a realistic example mermaid flowchart TB subgraph Mono["🏢 Modular monolith (one deployable)"] direction LR subgraph Ord["📦 Ordering: Hexagonal …