Redis for persistence, caching, rate-limiting, and background task coordination .Write unit, integration, and end-to-end tests (pytest, Vitest, React Testing Library, Playwright) and maintain healthy test coverage .Containerise services with Docker (multi-stage builds) and deploy/orchestrate them on Kubernetes — Deployments, Services, Ingress, ConfigMaps/Secrets, autoscaling … scan, and deploy pipelines with matrix builds and caching .Automated testing across the stack: pytest (with pytest-asyncio), Vitest/React Testing Library, and Playwright for E2E .Familiarity with observability tooling — structured logging, error tracking (e.g. Sentry), and tracing (e.g. OpenTelemetry/Jaeger) .Sound version control practices with ...