The Mercor AI interview: what it asks, the retake rule, and how to prepare

Mercor uses its own AI interviewer as the screen for its listings. It is a recorded interview on video, and Mercor’s data and AI usage page says the system generates questions based on your résumé and the job description. That is why the resume you upload matters: Mercor’s application guide asks for a PDF of one or two pages, under 2 MB.

Not every interview is the same kind. Mercor’s candidate FAQ says some are technical and require deep discussion of prior experience, and others test language or reasoning skills.

• A computer with a camera and a microphone. Mercor recommends the latest Google Chrome.
• The device check. It lists a working mic and screen sharing as required, and checks that your face is in frame, the light is good and the camera is steady.
• Screen sharing, in some interviews. Mercor says only full-screen sharing is supported, so share the whole screen, not a window.
• A whiteboard, in some interviews. Its content saves automatically.
• Your face and voice, throughout. Mercor asks you to keep your full face visible and your voice clear for the whole interview.

Identity checks come later. Mercor verifies your identity through Persona before you are onboarded to a project, and in most cases again each time you accept a new offer.

Mercor’s FAQ says most interviews take approximately 20 minutes, though some are shorter or longer. An attempt that ends much earlier than its planned length does not count, and the interview page then shows “Interview too short” with the date of the attempt.

In a technical interview, expect to be taken deep into past work: what you built, how, and why. The FAQ gives you a few rights during the conversation:

• You can ask the AI to repeat or clarify a question.
• If it interrupts you during a pause, you can tell it you weren’t finished.
• Extended silences may trigger an interjection, so avoid long pauses.
• If the interviewer stops responding, wait 30 to 60 seconds before doing anything else.

The official interview can be retaken up to three times across all applications related to that interview. A retake resets your application progress, and hiring managers can see your retake count. The waiting room asks you to keep retakes for technical problems.

Practice interviews are separate. Mercor says they are free, not tied to any application, and you can take them as many times as you like without affecting future opportunities.

Our advice: take a practice interview first, so the setup and the voice are not new on the day that counts. Retake the real one only for a cause you can fix, such as a dropped connection or a broken microphone, not because one answer felt weak.

Very little. Mercor’s FAQ says it is not able to share interview recordings or transcripts, and its application guide says it is unable to share specific feedback because of the volume of applications. Mercor publishes no pass score or rubric. You are notified when your application moves to the next stage.

That means practice is the only place you will hear your own answers back. Record one yourself and listen to it before the real interview.

Mercor’s LLM usage policy allows grammar and wording checks, and light refinements of phrasing as long as the ideas and structure remain your own. It also says submissions that are evidently produced by artificial intelligence will be identified and flagged. In a spoken interview there is nothing to polish, so the practical rule is simple: no AI help during the interview. Prepare with whatever you like beforehand.

1. Know every line of your resume well enough to talk about it for two minutes. The questions come from it. A line you cannot explain is better removed before you apply than defended on the call.
2. Pick one project to go deep on. Choose the one with the hardest decision in it. Know what you chose, what you rejected and why, what broke, and what you would change.
3. Practice out loud with a timer. Aim for a direct answer in the first sentence and an example after it. Out loud is the point: answers that read well on paper often run long when spoken.
4. Set up the day before. Install or update Chrome, test the microphone and the full-screen share, and find a quiet spot with light on your face.

If you apply to several listings that use the same interview, the three retakes are shared across them. Rehearse in the free practice interviews, and start the real one when you are ready for it.

Star Interview’s AI screening interview runs an AI screen by voice, built from your job description and your resume, with a clock on each main answer and a report on what a screener would have matched and missed. For the deep discussion of past work that Mercor’s technical interviews go into, practice a project deep dive, where an interviewer takes one project apart with you.

Neither is on video, and neither has a whiteboard or a screen share, so test those on Mercor’s own practice interview. For the round in general, read our guide to the AI interview. If another employer sent you to a different vendor, we have guides to the HireVue interview and to micro1’s Zara interview.

Star Interview is not affiliated with Mercor or with any employer’s interview vendor.