backend-development

Comprehensive backend development guidance covering modern languages, frameworks, APIs, security, and production patterns. Production-ready backend development with modern technologies, best practices, and proven patterns. Languages: Node.js/TypeScript (full-stack), Python (data/ML), Go (concurrency), Rust (performance) Frameworks: NestJS, FastAPI, Django, Express, Gin Databases: PostgreSQL (ACID), MongoDB (flexible schema), Redis (caching) APIs: REST (simple), GraphQL (flexible), gRPC (performance) See: references/backend-technologies.md for detailed comparisons Core Technologies: Security & Authentication: Performance & Architecture: Quality & Operations: Security: Argon2id passwords, parameterized queries (98% SQL injection reduction), OAuth 2.1 + PKCE, rate limiting, security headers Performance: Redis caching (90% DB load reduction), database indexing (30% I/O reduction), CDN (50%+ latency cut), connection pooling Testing: 70-20-10 pyramid (unit-integration-E2E), Vitest 50% faster than Jest, contract testing for microservices, 83% migrations fail without tests DevOps: Blue-green/canary deployments, feature flags (90% fewer failures), Kubernetes 84% adoption, Prometheus/Grafana monitoring, OpenTelemetry tracing API: Choose style → Design schema → Validate input → Add auth → Rate limiting → Documentation → Error handling Database: Choose DB → Design schema → Create indexes...