Rengrain In development · early access

AI interview coach for experienced engineers

Prepare for the interview only you will have.

Turn every rejection into a sharper next round.

Rengrain learns your whole career, not just your resume, plus the company and role you're up for. Then it drills you out loud on the questions this interview is likely to bring.

Tell Rengrain how the interview went. It finds the weak answers, the missed signals and the story you forgot you had, then turns them into your next practice session.

  • Your stories, not generic answers. It works from your projects, your roles and your past interviews.
  • A debrief after every interview. Real or mock, each one leaves a clear list of what to fix.
  • Practice out loud. Answer by voice. The coach asks follow-ups, like a real interviewer.
  • Feedback, then a retry. You redo the weak answer on the spot, not next week.
  • It remembers. Interview five starts from what interviews one to four taught it.
Get early access →

Get early access

Rengrain is in final development. Leave your email and we'll write when your account is ready. A few quick answers help us build it around your next interview.

Which plan would you start with? (planned prices, USD)

No payment now. No spam. One person reads every answer.

You're on the list.

We'll email when your account is ready.

If your interview is close, Anton, the engineer building Rengrain, may write to ask how you prepare. A reply helps more than you think.

How it works

A coach that gets better every time you use it.

It learns your career

Resumes, projects, old interviews. The detail a two-page PDF can't hold becomes material for your answers.

It preps you for this interview

Add the role and the company. You get the stories to lead with, the risks to cover and the questions to expect.

It turns every interview into practice

After a mock or a real interview, a debrief lists the weak answers and missed signals. They become your next drills.

What you get

Prep built for one interview: yours.

Know why it went wrong. Fix it before the next one.

prep planhypothetical example
Senior Backend Engineer · payments company
Round 3 of 4: behavioral + system design · in 6 days
Lead with
The billing migration you led in 2022: ownership, a hard rollback call, a measurable result.
Cover the risk
"Why did you leave after 14 months?" Have a two-sentence answer ready.
Expect
Idempotency and retries in payment flows. Your 2019 queue work fits here.
Drill today
weakConflict story: ran 3 min 40 s, no outcome stated.
debriefhypothetical example
Debrief · hiring manager call
From your notes 2 hours after the call
Missed signal
They asked about on-call twice. You answered about tooling, not about how you handle pressure.
Weak answer
fix"Biggest failure": you named a team failure, not your own.
Forgotten story
The 2021 incident review you ran fits the on-call question better.
Next drill
addedFailure story, 2 min, own the mistake, state what changed.

Both panels are made-up examples that show the format. They are not real users or results.

The difference

And no — it doesn't whisper answers during the call. It makes you the candidate who doesn't need that.

Generic practice toolRengrain
Same question bank for everyoneQuestions for your role, company and history
Starts from zero each sessionRemembers every session and interview
Feedback, then you're on your ownFeedback, then a retry on the same skill
Stops at the mock interviewDebriefs your real interviews too

Planned pricing

Start free. Pay when you're preparing in earnest.

Free

$0
  • 3 practice sessions a week
  • Up to 15 minutes each

Basic

$19/month
  • 10 practice sessions a week
  • Up to 30 minutes each

Pro

$49/month
  • 50 practice sessions a week
  • Up to 60 minutes each

Prices in USD. Monthly, cancel any time. Prices may change before launch. Early access is free; you pay nothing to join the list.

Questions

Fair questions.

Is this a live interview copilot?

No. Rengrain is preparation only. Nothing runs during your real interview.

How is this different from asking ChatGPT?

A chat starts from zero. You re-explain your career every time, and nobody keeps track of what you got wrong. Rengrain keeps your history, prepares for a specific interview, scores your spoken answers and brings weak points back until they're fixed.

Who is building it?

Anton Ulianov, a senior full-stack engineer in Calgary with 14 years in the industry. Rengrain grew out of the process he used to prepare for his own interviews.

What happens to my career data?

For early access we store only what you put in this form. In the product, your content is tied to your account and processed by the service providers needed to run it, such as the AI model provider. You can ask to see, correct, export or delete your data.

When can I use it?

We'll email you when your account is ready. We don't have a public date yet, and we won't invent one.

Your next interview is not a generic one. Don't prepare like it is.

Your last interview has lessons in it. Use them.

Get early access →