Achieve mastery
through challenge

Improve your development skills by training with your peers on code kata that continuously challenge and push your coding practice.

You have passed the initiation. Now the real training begins...

Additional Languages

*These languages are currently in beta. Once you enlist you will have an opportunity to train with them.

Sharpen your skills

Challenge yourself on small coding exercises called "kata". Each kata is crafted by the community to help you strengthen different coding skills. Master your current language of choice, or learn any of the 55+ programming languages supported.

Get Instant Feedback

Solve kata with your coding style right in the browser and use test cases (TDD) to check it as you progress. Retrain with new, creative, and optimized approaches. Find all of the bugs in your programming practice.

Earn ranks and honor

Kata code challenges are ranked from beginner to expert level. As you complete higher-ranked kata, you level up your profile and push your software development skills to your highest potential.

Tap into the collective wisdom

Compare your solution with others after each kata for greater understanding. Discuss kata, best practices, and innovative techniques with the community. Have your mind blown by how different other solutions can be from your own 🤯

Create your own kata

Author kata that focus on your interests and train specific skill sets. Challenge the community with your insight and code understanding. Create everything from common developer interview questions to challenges that push the limits of your creativity. Gain honor as a sensei within the coding dojo.