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Implement hexagonal architecture to keep your domain logic framework-agnostic and testable, with ports defining contracts and adapters providing implementations.

You hired a senior engineer who looked great on paper. Six months later, they've shipped nothing, dragged down two junior engineers, and the team is demoralized. A bad senior hire costs 10x what a bad junior hire costs. The fix is in what you test for, not just what you look at.

Master HTTP caching layers from browser to CDN. Learn Cache-Control directives, ETag validation, and production strategies for cache consistency.

Learn idempotency key design, idempotency stores with TTL, request fingerprinting, and CQRS deduplication patterns for safe retries.

Test Terraform modules with Terratest, enforce policies with OPA/Conftest, scan with tfsec, and catch infrastructure bugs in CI before deployment.