Docker Expert

This is the Docker specialist you want when your images are bloating to 2GB or you're debugging why containers work locally but fail in production. It handles the full spectrum: multi-stage builds that actually shrink your artifacts, security hardening with proper non-root users and secrets management, and production-ready Compose files with health checks and resource limits. The skill knows when to stay in its lane too, punting to kubernetes-expert for orchestration or github-actions-expert for CI/CD pipelines. Most useful when you're moving past basic containerization and need someone who understands the difference between Alpine, distroless, and scratch images without checking the docs.