Staffcoder

Staffcoder is a hands-on coding platform where developers practice real engineering work instead of algorithm puzzles. Choose from 1000+ challenges across 39 learning paths, covering React, Next.js, Django, Spring Boot, Docker, Kubernetes, AI agents, and more. Every challenge runs in a full browser IDE with a real terminal, file system, and live preview, so there is nothing to install. Pick a stack, open a challenge, and build. Free to start.