Explain Go best practices for large-scale applications.

Large-Scale Go Applications: • Project structure and organization • Dependency management • Code quality and standards • Testing strategies • Performance optimization • Monitoring and observability Project structure: cmd/ # Main applications internal/ # Private application code pkg/ # Library code api/ # API definitions web/ # Web application assets configs/ # Configuration files scripts/ # Build and deployment scripts Code organization: • Domain-driven design • Clean architecture • Dependency injection • Interface segregation • Single responsibility principle Testing strategy: • Unit tests with high coverage • Integration tests • End-to-end tests • Performance tests • Chaos engineering Performance: • Profile regularly • Optimize hot paths • Use connection pooling • Implement caching • Monitor resource usage Operational excellence: • Structured logging • Metrics and alerting • Distributed tracing • Circuit breakers • Graceful degradation • Health checks • Blue-green deployments