Don’t wing it. Prepr it.
Asks the follow-up, not just the first question
Hears every word and writes it down as you said it
You set the pressure, and can change it mid-session
InterviewerYou cut p95 latency 40% on the ingest service.
YouWe added tracing first. The slow part was the serializer, not the database.
InterviewerWhat did you rule out?
One place to rehearse
Upload a resume or your notes. Prepr pulls out the claims and checks them with you first, so every question is about your real work. Nothing gets invented.
Nothing gets invented.
Answer out loud, by voice or on video. Prepr listens, follows up where an answer gets thin, and lets you pause or interrupt whenever you need to.
You cut p95 latency 40%. What did you measure?
What did you rule out?
What happens at 10× load?
See what landed and what didn’t, attached to the exact sentence. Then retry one question instead of starting the whole thing over.
“We added tracing first.”
Named the metric and what you measured first.
Say what you ruled out.
Pressure
Start with the problem.
How did you decide?
Measured how? At 10× load?
felt less anxious after one session.
said it helped them prepare.
ask was more control over difficulty.
From Virtual Interviewers, Real Results, a study of 20 CS students (arXiv, 2025). Prepr wasn’t part of the study.
Features
Pick a sentence from a sample answer and see the feedback attached to it. Then write a stronger version right here.
“What changed when you made the health checks concurrent?”
Select a sentence to see what it did for your answer.
Pitches, presentations and speeches get their own practice: a prompt, one rule to work on, a minute of talking, and the number you’re trying to move.
Pitch your project to someone who has never heard of it. One minute.
No hedging. Say “we will”, not “we might”.
Questions you’ll hear
The questions that trip people up are the ones they’ve never answered out loud. Say them here, where it doesn’t count.
No. Prepr is the talking half: behavioral rounds, project deep-dives, pitches and talks.
Yes. Anything you’ve built has decisions and trade-offs to talk through. Nothing gets invented.
A Prepr account, a microphone, and for interviews a resume (PDF, DOCX or text) and a target role.
Pick Supportive, Standard or Pressure, and change it mid-session.
Recording is off by default. Keep the transcript, and delete the session whenever you like.
Your first session takes a few minutes and a microphone. Walk in having already said it once.