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Lessons (5)

• N+1 Queries, Loading & Pagination

  Prevent hidden query explosions, load relations intentionally, and paginate large changing lists without scanning the past. The hidden …

• REST API Design

  … resource naming, methods, status codes, pagination, versioning, errors and idempotency. The big idea A good API is like …

• API Contracts, Gateways and Security

  … security.svg) Define resource/command contracts, error shapes, pagination, idempotency and compatibility before implementation. JSON is common; Protobuf …

• State Management (Redux, Zustand, TanStack Query)

  … often forgotten Filters, search terms, pagination and tabs belong in the URL : they survive a refresh, can be …

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

  … Map , Set , for await (const chunk of stream) , paginated API helpers. --- 4. Mediator ✈️ Analogy: Planes don't talk …