Backend Patterns

This one gives you solid patterns for building maintainable APIs and backend services. It covers the repository pattern for clean data access, service layers for business logic, and proper middleware setup for auth and validation. The caching strategies are practical, showing Redis implementation and cache-aside patterns that actually work in production. Error handling is thoughtful with centralized handlers and retry logic. Most useful when you're moving beyond quick prototypes and need structure that won't become technical debt. The database optimization examples alone will save you from common N+1 query mistakes.