Try a 3-question mock interview, no sign-up

Three questions, about ten minutes, nothing to create and nothing to pay. You get one coding problem — and the code you write is compiled and run against the same stored test cases the full product uses, not just read by a language model — plus one behavioural question and one system-design question. Each answer comes back with a score out of ten and one specific thing to fix. At the end you get a short report, and you can create a free account if you want to keep it.

AI mock interviews

AI mock interviews for technical rounds: coding, DSA and system design

An AI mock interview is a practice round in which an AI plays the interviewer. Thita's are live voice sessions built for technical rounds: the interviewer asks a coding, DSA or system design question, follows up on the parts of your answer that are vague, runs the code you write against real test cases in 6 languages, reads the architecture you draw on a shared canvas, and returns a written report when the session ends. You can scope a round to a specific company or to your own resume, and the same interviewer also runs data science, product management and behavioural rounds. It is available whenever you are, and it does not need a partner on the other side.

AI mock interview FAQ: coding, DSA and system design rounds

What is an AI mock interview?

An AI mock interview is a practice round in which an AI plays the interviewer. On Thita it is a timed, spoken session: the interviewer asks a question, listens to your reasoning, asks adaptive follow-ups when an answer is thin, and reads the code you write in the browser. Code runs against real test cases in 6 languages — Python, C++, Java, JavaScript, Go and C# — so the interviewer reacts to what your solution actually does, not to what you say it does.

Is there a free AI mock interview?

Yes. The Starter plan is free forever and gives you limited access to AI mock interviews, code feedback and learning paths. You can also take a 3-question mock on this page without creating an account: one coding problem whose code is actually run, one behavioural question and one system design question. Pro and Elite add a larger monthly AI allowance, and international users also get a 7-day free trial on those monthly plans.

Does the AI interviewer actually run my code?

Yes. Coding and DSA rounds open an in-browser editor, and every submission executes against the problem's real test cases in 6 languages — Python, C++, Java, JavaScript, Go and C#. The interviewer sees whether the code actually passed, then asks about complexity, edge cases and the approach you chose.

Can I do a system design mock interview with AI?

Yes. System design rounds give you a shared canvas for components and data flow. The interviewer can read what you draw, asks about requirements, scale, bottlenecks and failure modes, and pushes back on choices you have not justified. The material behind it covers 12 system design families, 73 lessons and 26 worked case studies, plus low-level (object-oriented) design.

Can I practise a specific company’s interview?

Yes. You can scope a session to a company, a role, or a role at a company, and 160 companies have interview data behind them. A resume-based interview is also available: it reads your experience and asks about the projects on it, which is how most first rounds and hiring-manager screens open.

Which interview rounds can I practise?

Coding and data structures and algorithms, high-level system design, low-level design, data science, AI and machine learning, product management and behavioural rounds. The catalogue carries 51 interview roles and 23 round types. Single-problem coding rounds run for 30 minutes; role, company and resume rounds run for 45.

Do I get feedback after the interview?

Yes. Every session ends with a written report: what the interviewer asked, where the reasoning held up, which follow-ups you missed, and how the submitted code behaved on the test cases. Reports are kept in your history so two attempts at the same pattern can be compared.

Is an AI mock interview as good as a human one?

They do different jobs. An AI interviewer is available whenever you are, runs as many rounds as your plan allows, and never skips a follow-up, so it is the cheaper way to get the repetitions in. A paid session with an experienced human interviewer is better for a final calibration against a specific company bar, and a peer mock is free but depends on your partner. Most candidates use AI rounds for volume and save a human session for the last week.