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 must complete our beginner-friendly initiation challenge in order to sign up.

From Novice to Master

Sharpen Your Coding 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.

Zero Setup

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.

Level Up

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.

Your Developer Community

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 🤯

Community Driven

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.