Challenge yourself.
Prove it on the leaderboard.
Pick a skill, boot a real Linux box in your browser, and fix or build something under a one-hour timer. Every run gets a score out of 100, a tier, and a shareable rank.
Pick a skill to prove
Django
Track down bugs in a Django API: bad ids, N+1s, duplicate sends.
Kubernetes
Get stuck pods running: pulls, scheduling, DNS, endpoints, policy.
Next.js
Fix hydration, routing and state bugs in a Next.js storefront.
Docker
Get containers that will not start to stay up and keep their data.
AI Skill Test
Fix a broken app with an AI agent, and catch the mistakes it makes. Score the result, how you delegate, and whether you catch the agent when it is wrong.
AI & Agents
3 challenges
Agent-drivenVibe Coding Challenge
Ship a working feature by directing an agent, not typing it.
Hands-onPrompt Engineering Challenge
Get a model to do exactly what you meant, every time.
Hands-onAI Development Challenge
Build and ship a feature end to end with an agent.
Languages & Frameworks
8 challengesHands-onDjango Challenge
Track down bugs in a Django API: bad ids, N+1s, duplicate sends.
Hands-onPython Challenge
Find the bug hiding in a small Python program.
Hands-onNext.js Challenge
Fix hydration, routing and state bugs in a Next.js storefront.
Hands-onGo Challenge
Fix the race, the leak and the panic in a Go service.
Hands-onNode.js Challenge
Fix the crash, the string maths and the missing await in a Node API.
Hands-onJava Challenge
Fix a lost-update race, a heap blowup and an equality trap in Java.
Hands-onRuby Challenge
Fix the Ruby semantics that quietly do the wrong thing.
Hands-onReact Challenge
Chase down stale state and re-render bugs in a React UI.
DevOps & Cloud
6 challengesHands-onKubernetes Challenge
Get stuck pods running: pulls, scheduling, DNS, endpoints, policy.
Hands-onDocker Challenge
Get containers that will not start to stay up and keep their data.
Hands-onLinux Challenge
Chase silent failures: cron, name resolution and broken apt.
Hands-onNginx Challenge
Fix 404s, 403s, redirect loops and lost client IPs on a web tier.
Hands-onAnsible Challenge
Fix playbooks that lie: wrong types, drift and endless changes.
Hands-onGit Challenge
Recover a stuck merge and commits you cannot see any more.
