Most mock interviews don't move the needle. Pramp pairs you with a stranger who is also nervous. A friend-of-a-friend who works in the industry is too polite to deliver hard feedback. ChatGPT can ask the question but can't read your hesitation.
The mock interviews that change your performance share three properties.
1. The interviewer has read the job description
Generic mock interviews train you for the average interview. The interview you have on Tuesday is not the average. If your mock interviewer hasn't read the job description, every question will be the kind a generic senior engineer might ask — none specific to the role.
Cruto's persona-modeled mocks read the job description before the session starts. The first question references the posting's stated stack. The follow-ups drill on the posting's stated responsibilities.
2. The debrief names the moment, not the score
"You scored 78/100" is not actionable. "You stalled for nine seconds when asked about idempotency keys, then recovered with an analogy that lost the interviewer" is.
The debrief should name the moment in the transcript and the underlying gap. The score is just the index. The transcript is the data.
3. The repetition is structured
One mock won't change anything. Five mocks across two weeks, each in the same persona, with each debrief acted on between the next, will. The structure beats the volume.
This is what the Cruto loop is built around. Test → mock → debrief → repeat. Each round on the same role compounds.