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Lessons (19)

• What Are Design Patterns?

  Design patterns are named, reusable solutions to problems that keep coming up in software design. Meet the three …

• Architecture Patterns at Scale

  … central services, independently deployed services, event functions and decentralized peers](/img/system-design-l6/architecture-patterns.svg) Style …

• Which Pattern Do I Need?

  A problem-first guide for picking the right design pattern, telling look-alike patterns apart, and spotting when …

• Domain-Driven Design: Tactical Patterns

  … small, immutable, self-validating ⭐ Value objects are the easiest tactical pattern to adopt, and remove a huge class …

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

  … and database change capture](/img/system-design-l6/realtime-events.svg) Pattern Best for Key rule --- --- --- SSE Server …

• Event-Driven Architecture

  … Broker vs mediator topologies, the four kinds of event patterns, event design, and the real trade-offs. The …

• Indexes, EXPLAIN & Query Plans

  Design indexes from real filter, join and sort patterns, then prove improvements with query plans and production-like …

• Data in Microservices: Sagas & the Outbox Pattern

  … So microservices accept eventual consistency and use sagas. The saga pattern A saga is a series of local …

• Resilience Patterns

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

• Database Internals, Replication and Scaling

  … writes become durable log records, replicas serve compatible reads, and pools protect scarce connections](/img/system-design-l6 …

• What Is Software Architecture?

  … the business logic lives 🔴 High Design How is one part organised? Classes, patterns (Strategy, Repository), module APIs 🟡 …

• Domain-Driven Design: Strategic Design

  … DDD has two halves: Strategic design (this lesson) Tactical design (next lesson) --- --- --- Zoom level The whole business and …

• Scaling, Load Balancing & Rate Limiting

  … Design for it: Pattern Purpose --- --- Timeouts Never wait forever on a dependency Retries with exponential backoff + jitter Survive …

• Finding Service Boundaries with DDD

  … For the full picture, see [DDD strategic design](/learn/software-architecture/ddd-strategic-design) and [DDD tactical patterns …

• Microkernel (Plugin) Architecture

  … How VS Code, browsers, Webpack and ESLint are built, how to design a plug-in contract, and the …

• React vs Vue vs Angular

  … Huge community. - Vue 🪑 = a well-designed starter kit : friendly, gentle learning curve, official router and state library …

• SQL vs NoSQL Databases

  … scale UP"] V1[Server] -- V2["Bigger server 💪<br/ more CPU/RAM"] end subgraph Horizontal["NoSQL by design: scale …

• Serverless Architecture

  … Functions as a Service, event triggers, cold starts, pay-per-use pricing, managed backends, and the patterns and …

• Choosing an Architecture

  … Requirements, scale and teams change, so design for change : mermaid flowchart LR S1["🚀 Stage 1<br/ simple monolith …