Find what will break in your real interview.
Take a 30-minute mock interview with an AI examiner that keeps asking why until it finds the gaps in your reasoning.
Get your weak spots ranked by severity, the evidence from your answers, and a personalized repair plan.
3 free mocks · No card required · Full diagnostic report included
More questions will not save you.
You may have solved hundreds. You still do not know which answers survive "Why?" or "What did you just assume?"
One timed diagnostic finds the three that can still kill your interview, ranks them by risk, and tells you what to fix first.
Diagnose. Fix. Prove.
Three free completed mocks form one evidence loop: find the gaps, repair them, then test whether the repair held.
One timed mock probes every claim and records which criteria your answer did, and did not, defend.
Observed weaknesses become a ranked repair plan of targeted drills, so the next study block starts with evidence.
The next mock retests weak topics through fresh reviewed problems. A risk tier moves only after conclusive evidence.
Illustrative study block · your plan follows the observed risks.
3 free completed mocks · no card
A ranked list, not a feeling.
The report ranks only weaknesses supported by recorded criteria, separates technical correctness from interview behavior, and names what has not been tested yet.
Move your cursor to inspect · tap on mobile
Reviewed before any mock. They cannot change mid-interview.
Every verdict points to evidence from the attempt the server recorded.
Thin evidence never becomes a score. Untested topics are named, not guessed.
Timed. No hints. No restart.
Two to four questions per sitting, your choice.
The limit adjusts to seniority and question count.
The examiner stays in interview mode until the debrief.
“Why the log?”
Round three at WorldQuant. Four months of preparation. He asked me to explain logistic regression, and I relaxed: finally, something familiar.
Then he cut in. My brain froze. Not because I had never used it. I knew it well enough to pass interviews, not deeply enough to defend it. I sat there in silence, and I knew the interview was over.
Most people practice polished answers. Great interviewers look for the cracks underneath them. I built the thing I wish I had back then.
Aleksandr Zvonarev · Founder
What gets tested today.
Six published pillars plus a standalone interview bank. Every listed problem has fixed, reviewed criteria and can run live.
INT marks the standalone interview problem bank; problems are added after review. Curriculum drills run in three layers: DEF (define), UND (understand), PRB (apply).
Choose the access that fits your timeline.
Every account starts with three free completed mocks. Subscribe monthly, or pay once for unlimited access.
One payment. Full access for the life of the product.
- Full published curriculum
- Unlimited live sessions + timed mocks
- Mastery tracking across sessions
- No subscription, no renewals
Full access while your subscription is active.
- Full published curriculum
- Unlimited live sessions + timed mocks
- Mastery tracking across sessions
- Cancel anytime from billing settings
For teams, bootcamps, and universities preparing candidates at scale.
- Custom quote based on cohort size
- Discuss onboarding and problem-set needs
- Direct contact with the founder
Prices in USD. Your report and repair plan stay available on the free tier.
Asked before buying.
Short answers. The FAQ inside the product goes deeper.
Do I need a card to start?
No. Create an account and you can complete three mock interviews for free without adding a payment method.
What does the diagnostic give me?
A ranked list of weaknesses supported by your recorded answers, a separation of untested topics from observed risks, and a repair plan of targeted drills. Tiers are HIGH, MEDIUM, and HELD, not a made-up readiness percentage.
What counts toward the three free mocks?
Only a mock that reaches a completed result. Starting, scheduling, or abandoning a sitting does not use one.
Who is this for?
Candidates preparing for rigorous Quant, ML, AI Engineering, FDE, and Data Science interviews where reasoning must be defended, not recited.
How is the diagnosis graded?
Every published problem has fixed, reviewed criteria. The server records the attempt, the grader must cite what you actually said, and deterministic checks validate those citations. Thin evidence stays inconclusive.
Why not ChatGPT or a question bank?
Both are useful practice. Neither gives you the full loop by default: a fixed reviewed problem, a recorded timed attempt, evidence-checked grading, a ranked diagnosis, a repair plan, and a proof mock that retests observed weaknesses.
What is covered now?
Probability, combinatorics, statistics, linear algebra, ML foundations, and AI engineering, plus a standalone interview bank across finance, brainteasers, and applied AI systems.
What happens after my third free mock?
Starting another mock requires a paid plan. Your diagnosis, repair plan, and completed debriefs stay available either way.
The real interview won't go easy on you.Neither will this.
Run the free diagnostic. Get your risk map and repair plan before interview day.
No card required · Your report stays available