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.
Pick your challenge
19 challenges across AI, frameworks, DevOps and data. Each one boots its own box.
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.
