Interviewer
For engineers prepping the system-design round

Practice with an AI that interviews like the real thing.

Talk through your design out loud, sketch on a shared whiteboard, and get pushed on trade-offs in real time — then an honest debrief. Your first interview is free.

Live voice
Talk through your design
An expert interviewer that listens, probes, and adapts in real time.
Whiteboard
Draw it out
Sketch the architecture; the interviewer sees and reacts to your diagram.
Demo video coming soon
Report
Get a real debrief
An 11-dimension scorecard with strengths, gaps, and next steps.
11
dimensions scored
Any
company or role
Any
seniority level
How it works
1
Pick your loop
Company, level, and length. The interview calibrates to you.
2
Interview by voice
Whiteboard, talk, get pushed on trade-offs — just like the real thing.
3
Read your debrief
A structured score and a focused plan for what to fix next.
What people say

“Felt eerily close to my real Staff loop. The follow-ups were relentless.”

Senior Eng, fintech

“The whiteboard awareness is the part I didn't know I needed.”

Staff Eng, big tech

“Best 45 minutes of prep I did all month. The report was brutally useful.”

L5 → Staff candidate

“It pushed on trade-offs the way a real interviewer does.”

Principal candidate

“Finally something that practices the conversation, not flashcards.”

EM, marketplace

“Felt eerily close to my real Staff loop. The follow-ups were relentless.”

Senior Eng, fintech

“The whiteboard awareness is the part I didn't know I needed.”

Staff Eng, big tech

“Best 45 minutes of prep I did all month. The report was brutally useful.”

L5 → Staff candidate

“It pushed on trade-offs the way a real interviewer does.”

Principal candidate

“Finally something that practices the conversation, not flashcards.”

EM, marketplace
Features

Everything the real room has — on demand.

Adaptive difficulty
Tune the seniority bar to your target role — the interviewer drives, or steps back and lets you lead.
Company calibration
Calibrate the interview's style and bar to the company and role you're aiming for.
11-dimension scorecard
Scored on requirements, scaling, data, trade-offs, communication, and more.
A whiteboard the AI reads
Sketch on an Excalidraw canvas the interviewer understands and questions you on.
Progress over time
Track scores, strengths, and weak areas across every session.
Honest debrief
A shareable report with strengths, gaps, and exactly what to fix next.
Pricing

Pay as you go, or subscribe.

Free
$0
Try a full interview
✓ 1 system-design interview
✓ Voice + whiteboard
✓ Full report
Solo
$5
Single interview
✓ 1 interview
✓ Valid 30 days
✓ Full report
Starter
$20
Practice pack
✓ 5 interviews
✓ Valid 30 days
✓ Save vs. single
Popular
Subscription
$29/mo
Best value per interview
✓ 10 interviews / month
✓ All company modes & levels
✓ Progress tracking
Pro Prep
$39
No subscription
✓ 10 interviews
✓ Valid 60 days
✓ Pay once, no renewal

Prices shown in USD; billed in the local INR equivalent at checkout. Teams & universities — get in touch.

FAQ

Questions, answered.

Is it really like a real interview?+

Yes — it's a live voice conversation on a shared whiteboard. The interviewer asks follow-ups, pushes on trade-offs, and adapts to your level, just like a real loop.

Can I target a specific company or level?+

Yes — calibrate each interview to the company and seniority you're aiming for, and the interviewer adapts its style and depth to match.

How do credits and validity work?+

Each interview costs credits. Buy a single interview or a pack (valid 30–60 days), or subscribe for a monthly allowance. Your balance and expiry are always visible in Settings → Credits & usage.

What do I get at the end?+

An instant, shareable report: an 11-dimension scorecard with your strengths, gaps, and a focused plan for what to fix next.

Do you offer team or university plans?+

Yes — get in touch and we'll set you up.

About

Built to make the hardest interview practiceable.

System design is the one interview you can't really rehearse — it needs a senior engineer, a whiteboard, and a real conversation. We rebuilt that loop with real-time voice and an interviewer that adapts to you, so you can practice the conversation as many times as it takes.

Questions or partnerships? support@agentsurf.io