Coding challenges, but for real.

LeetCode is a bank of algorithm and data structure problems. We have that too, of course, but Boot.dev isn't just limited to algorithm puzzles. You can also practice everyday backend skills like SQL, HTTP, and concurrency, fix bugs in code someone else wrote, take quizzes, and do mock interviews.

We've hand-written thousands of challenges, but freshly generated challenges are created using those as a seed, and then are further iterated on as students leave feedback - it's not just one-shot slop. The challenge recommendation engine uses tactics like spaced repetition, deep personalization, and a focus on mastery-based-outcomes.

• Learn about spaced repetition

Yes! We don't give you a complete from-scratch editor, because that would frankly just be annoying and cumberson, but you can enter a highly-detailed custom prompt, to get a new challenge based on that prompt and your learning history.

Except for sharpshooter sprees, game mechanics like streaks, quests, etc. all work the same way in challenges as they do in the courses, but the base XP gain of challenges is lower than in regular courses.

AI is involved in the challenge (but not course) creation process, so occasionally you'll get some weird stuff, even with all the safeguards, prompts, tests, and hand-crafted examples we've put in place. That said, most challenges have been taking by other students before and iterated on, so the odds of getting a bad one are very very low.