Free

$0 forever

The full course and practice tools.

All 223 lessons, beginner to advanced
223 lesson challenges and 30 practice exercises
6 guided system builds you can download
Prompt playground (daily run limit)
One sample AI debugging round (coming soon)

Start learning

ProComing soon

$19 per month, or $149 a year

Practise the interview rounds companies now use.

All 223 lessons, beginner to advanced
223 lesson challenges and 30 practice exercises
6 guided system builds you can download
Prompt playground

Plus with Pro

Every AI debugging round: real-sized codebases with bug tickets to fix
Timed interview mode with a written debrief
Verified results and certificates you can share
Unlimited playground runs
Round history and progress across topics

Join the waitlist

TeamsComing soon

$15 per seat per month, 5 seats minimum

Upskill an engineering team or run hiring rounds.

Everything in Pro, for each seat

Plus with Teams

Assign rounds and track progress on a team dashboard
Hiring mode: send a round to a candidate and review their fixes
University and bootcamp pricing on request

Questions

Will the lessons stay free?

Yes. Every lesson, challenge and guided build in the course stays free. Paid plans add interview practice and verification on top.

What is an AI debugging round?

You get a working codebase of the size you meet at work, with retrieval, embeddings, an LLM client and an agent, plus a few bug tickets written like real reports. You fix the bugs with any tools you like, including AI assistants, and a checker confirms which tickets are fixed.

Why pay for rounds instead of LeetCode?

Many companies are replacing puzzle questions with rounds where you work in an unfamiliar codebase. Rounds practise that: reading code you did not write, narrowing a symptom down to a cause, and fixing it without breaking anything else.

When do Pro and Teams launch?

They are in development. Join the waitlist and we will tell you when they open, with launch pricing for people on the list.