Mock interview loops, on demand
Upcoming loop, nobody to mock with. Run the first round whenever you are ready.
Rebuild just the rounds you have left, or run a full loop at your level. Behavioral and system design rounds are spoken, with follow-ups on what you said and what you drew; coding runs for real against tests. Every round comes back with a Hire or No Hire and the reasons. Nothing to schedule, no card, and a custom loop can be as short as a single round, so a spare hour is enough to get a rep in.
No credit card required
Our users have landed roles at
Senior SWE Loop · 5 rounds · ~3h
Hire8/10
Pacing
7/10
Correctness
5/10
Independence
- Hire
Kth missing number
Coding
- Hire
Connect two islands
Coding
- Hire
Multi-region failover
System Design
- Hire
Distributed event streaming
System Design
- No Hire
Disagreeing with a technical decision
Behavioral
On demand
Start whenever you are ready
Sign in, pick a level or the rounds you have left, and go. Nothing to book and nobody to wait on.
3
Full loops free in the trial
14 days, no credit card. Enough to judge the platform for yourself before paying anything.
Hire / No Hire
A decision after every round
The call a debrief would make after each round, with the reasons written out rather than a vague score.
Rerun
Any round that came back No Hire
Build a custom loop of just the round that failed and run it again. The second attempt tells you whether the fix held.
Nobody to mock with
Is an AI mock anything like the real thing, or just a problem bank with a timer?
A problem bank with a timer cannot ask why you built it that way, and it will never tell you No Hire. Here the rounds interview you: follow-ups built from what you actually said and what you drew, coding graded on real execution, and a decision after every round backed by what the interviewer saw.
It talks back
Follow-ups that engage with what you actually said
Work the behavioral and system design rounds out loud, and the interviewer picks up on what you said: which part of that story was specifically yours, what happens to the upload when a transcoder dies mid-job. The next follow-up comes from whatever you just said, so a rehearsed answer only carries you until the first question about the details.
It grades like a debrief
Scored round by round, then a decision with the evidence
Every round comes back with a Hire or No Hire and what it was based on: the edge cases you missed, the trade-off you waved past, the story that never named your part in it.
It is there at 11pm
Loops at your level, or built from the rounds you want
Curated loops at your level, or a custom loop made of exactly the rounds you want to rehearse. Nothing to schedule, and nobody to owe a favor when you decide late on a weeknight that you want one more rep.
Inside the rounds
Follow-ups in the moment, and a debrief that shows its work
Coding: real execution against tests, with a debrief that names exactly what it saw.
Unique permutations of integers
Coding · debrief
Correctness: Strong · Optimality: Needs work · Round: Hire
Behavioral: the follow-up about which part of that story was specifically yours.
Describe a time when you had to disagree with a technical decision made by your team lead or manager
Behavioral · voice on
Story ownership: Needs work · Scope: Mid-level · Round: No Hire
System design: the follow-up about what fails first, asked against what you drew on the whiteboard.
Design a video sharing platform
System Design · 45 min
Afterwards: the skill assessment, rated skill by skill, with the evidence behind each rating in the written feedback.
Reps that fit your schedule
Single rounds when you have an hour, the full loop when you want the rehearsal
A custom loop can be as short as a single round, so a rep fits in whatever hour you can spare, and a phone screen is usually one coding round on its own, which maps cleanly to a single custom round here. The full loop runs in one block on purpose: holding up across a string of rounds is its own skill, and the only way to build that endurance is to run them together.
- 1
First: one cold coding round
This is the screen rep, and the screen is usually the gate on whether the rest of the loop happens at all. The readout tells you whether your prep needs a touch-up or a rebuild, early enough to do something about it.
- 2
Next: the rest of the rounds, one rep at a time
Build custom loops from exactly the rounds you want to rehearse and run them as your schedule allows, in whatever order suits. Each comes back with its own decision and debrief.
- 3
Then: rerun whichever round came back No Hire
The skill assessment and coach advice from that round name what went wrong (the edge cases missed, the trade-off waved past). Practice questions here cover all three disciplines and adapt to your level, so you can drill those exact gaps outside the pressure of a loop, then build a custom loop of just that round and run it again. The second attempt tells you whether the fix held.
- 4
Before the real thing: one full loop, start to finish
Run the whole sequence in one block at least once. The later rounds are where being tired starts to show, and the full run is the one that surfaces which round is still shaky, with time left to rerun it.
Interview Readiness
Senior SWE
- 1Unprepared
- 2Building
- 3Almost There
- 4Prepped
A practice signal computed against the level you picked, not a prediction.
Pricing for the reps you need
Start with three free loops, then keep everything running while you interview
The trial is three full loops over 14 days with no card, so you can see exactly how the grading works before you decide anything. Complete Prep below opens up unlimited loops, the courses and adaptive practice, monthly while you are interviewing or lifetime if you would rather pay once, and you can cancel the monthly whenever you are done.
- Practice coding, system design and behavioral problems
- Adaptive practice mode that adjusts to your skill level
- Unlimited mock interviews to validate your readiness
- Detailed debrief and feedback after each session
- Skills gap analysis to identify your weaknesses
- Access to structured courses for all disciplines
- Personalized coach advice to help you improve
- Detailed metrics to track your progress
- Weekly goals to keep you on target
No credit card required
Pricing for the reps you need
Start with three free loops, then keep everything running while you interview
The trial is three full loops over 14 days with no card, so you can see exactly how the grading works before you decide anything. Complete Prep below opens up unlimited loops, the courses and adaptive practice, monthly while you are interviewing or lifetime if you would rather pay once, and you can cancel the monthly whenever you are done.
- Coding, System Design and Behavioral practice problems
- Adaptive practice mode
- Unlimited mock interviews
- Detailed loop debrief and feedback
- Progress tracking & skill gap analysis
- Personalized coach advice
- Structured courses for all disciplines
Success stories
From people who know what a real loop feels like
“The analytics and feedback here are incredibly detailed. Going through the mock interview loops felt like I was actually at an onsite loop, not a watered-down practice session. Highly recommend!”
“I tried multiple platforms, but Preppable is by far the best. The system design interviews with interactive drawing boards are exactly like the real thing. The follow-ups and deep dives are very thorough and helpful.”
“Preppable's behavioral interviews are a game changer. They teach you how to structure your stories effectively and give you detailed feedback on your communication skills. This is an area that is critical in landing offers (especially for senior positions), but isn't available in any competing platforms.”
Have questions?
Frequently Asked Questions
Try it out
Run a loop before the one that counts
Pick a full loop at your level, or build one from just the rounds you want to rehearse, and start whenever you are ready. The first debrief decides what the rest of your prep is for. Three full loops free, 14 days, no card.
No commitment trial · No credit card required