An AI interviewer runs a real round with you. It asks questions and follows up, runs your code against hidden tests, and ends with a scorecard that tells you what to work on next.
THREE KINDS OF ROUND.
Each round is the length of a real one, with a timer, or untimed if you’d rather take it slowly. Pick a problem, or let it surprise you with one you haven’t had.
CODING
A problem from the course’s interview part, at Easy, Medium or Hard. Clarify it, explain your approach and its complexity, code it, and run it against hidden tests, while the interviewer asks what a real one would.
194 problems · 11 languages · 30 to 45 minutes
SYSTEM DESIGN
Design a real system: scope, data, API, the busy path and the numbers, then scale, failures and trade-offs. Take notes one step at a time and draw the parts on a board as you go.
100+ problems, from a URL shortener to Uber · 45 minutes
NEW · AI ASSISTANT ON
A codebase you didn’t write, failing tests, and an AI assistant in the editor. Explain how it works, find and fix the bugs, then add a feature or make it fast, and check what the AI tells you before you trust it.
Easy, Medium and Hard rounds · Python · 20 to 45 minutes
HOW A ROUND WORKS.
Practice it as a mock interview, which ends with a verdict, or as coached practice, where the coach gives hints and explains as you go.
CHECK THE AI.
More interviews now let you use AI, and what they test is whether you can tell when it’s wrong. In the code comprehension round, the AI assistant sees all the files and is genuinely useful, but a few of its answers are planted mistakes that sound right. Your scorecard says which ones you caught.
WHAT’S INCLUDED.
Every account gets one free mock interview, any kind. PRO includes more, and packs are there for the weeks before an onsite.
FREE ACCOUNT
1mock interview, any roundPRO YEARLY
12a year, to use whenever you like. The 7-day free trial includes one of each kind.PRO MONTHLY
1a monthPRO LIFETIME
30in allNeed more? Packs for anyone: 5 mock interviews for $19.99 or 15 for $49.99. They never expire, and they’re used after the ones your plan includes.
See PRO plansNo, it’s an AI. It runs the round the way an interviewer at a top tech company would: it asks you to clarify the problem and explain your approach, follows up on what you say, and pushes on complexity, edge cases and trade-offs. Then it scores the whole round against the same rubric every time.
A mock interview is like the real thing: the interviewer assesses, doesn’t help much, and you get a scorecard with a verdict. In coached practice a coach thinks along with you, gives hints when you ask, and explains as you go; you get feedback instead of a verdict. Both count as one interview.
Coding rounds work in all 11 of the course’s languages: Python, JavaScript, Java, C++, C#, TypeScript, Kotlin, Scala, Go, Swift and Rust. The code comprehension rounds are in Python. System design rounds have no code: you take notes and draw the design.
Yes, though a computer is easier. Code comprehension rounds have several files to read, so they’re best on a bigger screen. To speak instead of typing, allow the microphone when your browser asks.
At the end, the whole conversation, your code and its test results are scored on the skills that round tests, for example problem solving, coding, testing and communication in a coding round. You get a verdict (from no hire to strong hire), a score for each skill, what went well, what to work on, and the lessons to practice next.
Each round you start, mock interview or coached practice. If you end it within the first 2 minutes, it doesn’t count.
No. A pack is a one-time payment, and its interviews stay on your account until you use them. They’re used after the ones your plan includes.
NO CARD NEEDED.
Pick a round, talk it through, and see your scorecard.
Coding · System design · Code comprehension