Practice the interview, not just the problem.
Live AI mock interviews for DSA, low-level design, and system design — the full loop, calibrated L3 to Principal. Sit one the moment you want it, out loud, scored the way a real interviewer would.
Built on 6½ years of running the live interview infrastructure companies screen you with — 5,000+ concurrent sessions, millions of events a day. See a real scored report →
Prep for interviews at companies like
Every round ends in a report like this one.
A real scored report from a 22-minute DSA mock — Longest Consecutive Sequence, interviewed at the L5 bar. Not a mockup.
Seniority read · lean yes
“wait. umm. that gives me best equals one, but the answer should obviously be three… so something's off. hold on.”
The questions everyone asks first
Straight answers — including the awkward ones about money and your data.
Is an AI interviewer actually any good?
It's a live, voice-to-voice interview — not a quiz. The AI gives you a problem you haven't seen, listens while you think out loud, pushes back on your trade-offs, and scores every dimension against a bar calibrated from L3 to Principal. The fastest way to judge it is to read a real scored report, or just use your two free mocks each month.
How many mock interviews do I get?
Every account gets 2 free AI mock interviews a month, forever — no credit card required. Paid plans include a larger monthly allowance (the exact number is on each pricing card), and one-time credit packs top you up whenever you need extra rounds.
Do you record and store my voice?
Audio and transcripts from a mock are used to conduct the interview and generate your scored report, and are shared only with the trusted AI providers that power the interviewer, under our privacy policy. When you delete your account, your personal data is deleted or anonymized, and you can request deletion of your data at any time.
How is it scored — is it consistent?
Every mock is scored per dimension against the same calibrated rubric, with a seniority read and the key moments that drove the verdict. Two attempts at the same level are judged by the same bar — not by an interviewer's mood on the day.
Can I get a refund?
Try before you pay: all the content is free and every account gets 2 free mocks a month. Because plans and credits unlock digital services that are accessed immediately, fees are generally non-refundable once used — except where the law requires it or something is materially defective. You can cancel any time and keep access until the end of the paid cycle.
How is this different from peer platforms or a human mock?
No scheduling and no peer roulette: a real interview round starts the moment you want one — 1am included — and a single human mock typically costs about as much as a whole month of Standard. You practice the interview itself: thinking out loud, defending trade-offs, and being scored the way a real interviewer would score you.
What kinds of interviews can I practice?
All three rounds of a modern SDE loop. DSA coding (LeetCode-style problems, voice plus a shared working page), low-level design (machine-coding rounds like a parking lot or Splitwise, and systems-programming rounds like a memory allocator or thread pool), and system design (voice plus a live whiteboard). Every round is calibrated to the level you pick, L3 to Principal, and ends in a scored per-dimension report. All three draw from the same monthly mock allowance.
I built the thing I couldn't find.
I spent six and a half years building the live interview infrastructure companies use to screen candidates. Then I went to prepare for my own interviews and couldn't find a cheap mock with zero scheduling friction — so I built one, for myself.
Kumar Kisalay
Founder · ThyncLabs
Your first round is waiting.
Two free mock interviews a month. Nothing to book, nobody to wait for — decide you want a round and you're in one.
No credit card · No scheduling