The system design interview, for AI engineering roles.
Most prep still drills URL shorteners. AI engineering loops ask you to design the system around the model: chat that streams, RAG, evals, GPU batching, agents with tools. Watch full mock interviews of those problems, and answer before the candidate does.
A worker freezes. Another takes over. Then the first one wakes up.
What do you say next?
The questions changed. Most prep didn't.
- URL shortener
- News feed
- Rate limiter
- Ride hailing
- Ticket booking
Still useful. Not what an AI engineering loop leads with.
Candidate-reported, with the source on each problem.
- Watch the full interview: the questions, the wrong turn, the recovery.
- Answer each hard probe before the candidate does.
- Compare your reasoning with where mid, senior and staff land.
The interviewer steps out and tells you the level.
What junior and mid answers stop at, what senior adds, and what made this one staff. Including where the candidate slipped.
final board · yours to editRoadmap: what we're scripting nextNot included until it ships. Batch inference, RAG with citations, LLM evals…
These are scripted mock interviews, not recordings of real candidates. Each problem starts from public candidate reports and published interview formats, the script is reviewed for technical accuracy and for sounding like people talk, and the voices are AI. That's what lets us cover every problem, and later every level. The candidate is strong but not perfect: he slips, gets corrected and recovers.
Start free. Go Pro as the library grows.
Available today Design ChatGPT, staff level, 27 min · Next up: Distributed job scheduler
With your email.
- The full Design ChatGPT interview
- The first probe, with the level comparison
- The final board
12 months of access. Pay once, no automatic renewal.
- Every probe in every interview, with the level comparison
- Written breakdowns and searchable transcripts
- Every new interview we ship in those 12 months
- Practice with Mei, the interviewer, when it ships (beta)
Full refund within 14 days if it isn't for you.
Questions
Is this a real interview?
No, and we say so up front. It's a scripted mock interview, reviewed by engineers and voiced with AI, built to sound and run like a real round: the candidate asks, guesses wrong, gets probed and recovers.
Who is it for?
Engineers preparing for system design rounds, especially AI engineer, AI infra and applied AI loops, at senior and staff level. Classic problems (chat, booking, feeds) come next.
Do I need to know Redis, SQS or Kafka?
No. Interviewers listen for the idea (a lease, a fence, a cursor, backpressure). Products come up as examples, and the breakdown explains them.
Where do the questions come from?
Public candidate reports, which we link with the date we read them. We never claim a company asks a question, and companies don't endorse this site.
How does the free plan work?
Leave your email after the first probe. You get the full Design ChatGPT interview and its board, and an email when the next interview ships. Pro adds every probe, the breakdowns and every new interview.
What happens when I pay?
One payment for 12 months (or 30 days), no automatic renewal. Full refund within 14 days if it isn't for you.