Read the system
Start with a repository, a clear brief, and constraints that matter — the scoping skill AI still can't do for you.
AI-ready Engineering challenges
Solve Real Engineering Problems
Dear DSA, F*CK you respectfully!
Realistic repository based engineering problems. Real engineers will go beyond DSA.
Join the engineers already solving real problems
- 0Active users
- 0Runs
- 0Submissions
*Updated weekly
QueueProcessor.java
12public boolean process(Message message) {
13 if (message.isExpired()) {
14 return false;
15 }
16 queue.publish(message);
17 return true;
18}Make the change
Work directly in focused files without the noise of a full IDE — hands-on craft that teaches you to harness AI.
Submit with intent
Track the outcome of each solution as the judging system evaluates it — and build judgment AI can't replace.
Your AI Sidekick
Use AI to solve real engineering problems
Your AI Sidekick works from the exact files you're editing, so you learn to harness AI on real code — asking questions, weighing trade-offs, and seeing how a fix comes together, at the level of assist you choose.
Bring your own OpenAI, Gemini, Anthropic, or DeepSeek key — it never touches our servers.
AI SidekickAssist · Explore
Where should I start?
Open
QueueProcessor.java and read the brief — the change belongs in process(). Every message should still get published.Stuck? Switch me to Solve and I'll walk you through the fix.
- ChillPoints you in the right direction, one hint at a time.
- ExploreTalks through the trade-offs and how the system fits together.
- SolveShows the fix and explains it — when you're ready for the answer.
What's new
Latest updates
Handbooks
NewCore-concept reading material right inside the workspace, with diagrams rendered inline.
Run without submit
NewDry-run your solution through the judging pipeline without recording a submission.
Public profiles
NewShare your solved counts and activity heatmap with a public profile.
Solved badges
See which problems you've already solved, right from the catalog.
AI Sidekicks
Bring your own key and pair with an AI that works from your exact files — at the level of assist you choose.