LeetArena
Arena online
Production incident arena

Think you're an elite engineer? Prove it.

AI can write the code. Can you still engineer?

Solve real production failures. Compete with engineers worldwide. Prove your value in the age of AI.

Enter the arena  →
Incident // 00:00:01

Production doesn't come with instructionsSomething is broken.

Users are complaining.
Metrics look wrong.
Logs are noisy.
The obvious fix might make things worse.
Your move

Figure out what's actually happening. Fix it.

The arena

Real systems. Real pressure.

You get a production incident, incomplete information, and a system you need to understand.

No multiple choice.
No isolated algorithm puzzles.
No perfectly defined task.
01Investigate.
02Find the root cause.
03Resolve the failure.

Every decision counts.

The new baseline

The skill is changing

Writing code is getting easier.

Understanding complex systems isn't.

The engineers who stay valuable will be the ones who can navigate uncertainty, connect the dots, and make the right call when things break.

That's what LeetArena tests.

Open toolkit

Use your tools

Docs Logs Metrics AI
Leeta

Use whatever helps you solve the problem.

Leeta, our AI assistant inside the arena, is there when you need it. The judgment is still yours.

Measured under pressure

Compete on what matters

Every scenario gives you a score based on how well you handled it.

StartSolve more incidents.
AdvanceTake on harder simulations.
CompeteClimb the leaderboard.
Position↑ You

Think you're better than the engineer above you? Prove it.

Behind the arena

Built by an engineer, for engineers

Michal Bukovy, creator of LeetArena
Michal Bukovy Engineer // Founder

Hey, I’m Michal.

I’ve spent 15+ years building software as an engineer, architect, CTO, and founder.

AI is changing how we write code. But understanding complex systems, navigating uncertainty, and making the right call when things break matters more than ever.

I built LeetArena to put those skills to the test - and make it fun.

The enduring skill

The systems will change. The skill won't.

AI will write more code. Systems will become more complex.

Someone will still need to understand what's happening when everything goes wrong.

Be that engineer.

Start your first incident  →