This skill provides backend and API implementation patterns for building robust, scalable services. When to Invoke This Skill Automatically activate for: - API endpoint implementation - Database operations and queries - Authentication and authorization - Caching and performance optimization - Service architecture design API Design Patterns Consistent Response Structure Route Handler Pattern Service Layer Pattern Repository Pattern Service with Business Logic Authentication Patterns JWT with Refresh Tokens Middleware Pattern Database Patterns Query Optimization Transaction Pattern Caching Patt…