InterviewSkool: AI mock DSA & System Design interviews that feel real

Hey Product Hunt 👋 I'm Deevankshu - backend engineer by day, solo founder of Interview Skool. This didn't start as an AI product. It started as a human-run mock interview service, and I sat in on the sessions myself. The pattern was brutally consistent: strong engineers weren't failing because they didn't know the material. They were failing on the parts nobody ever gives them feedback on - the requirement they never clarified, the tradeoff they hand-waved past, the exact minute they lost the interviewer. You can't scale that kind of feedback with humans. So I rebuilt it. What Interview Skool does: → DSA and system design mock interviews with an interviewer that pushes back instead of nodding along → A real canvas for system design - you draw the architecture, and it understands you when you say "this queue here" or "move that behind the cache" → A feedback report scored against actual rubrics, showing where your answer started to fall apart and why Built for engineers who need reps before a real loop, priced so you can do it weekly instead of once before the big interview. I'd genuinely like the harsh version of your feedback. And if you've ever been on the interviewer side of the table: what's the signal you judge candidates on that they never find out about?