Production-grade backend systems with Go's concurrency model, web servers, databases, and microservices architecture.

• Goroutines and channels enable lightweight concurrent processing with thousands of simultaneous operations; patterns include pipelines, fan-out/fan-in, worker pools, and explicit cancellation via context
• HTTP server fundamentals cover request handling, middleware chaining, routing, and context-aware handlers; includes RESTful API structure and WebSocket patterns
• Database integration covers connection pooling, query patterns, transactions, and prepared statements with context support for timeouts and cancellation
• Microservices patterns include service discovery, circuit breakers, gRPC services, and graceful shutdown; production features cover structured logging, health checks, rate limiting, and panic recovery
• Best practices emphasize goroutine lifecycle management, channel discipline, error wrapping, input validation, and >80% test coverage with table-driven tests and benchmarks