jobby, mock interview prep

Practice system design interviews by talking through them.

Jobby is a voice-first mock interviewer. You speak your design out loud. It listens, asks follow-ups, challenges your tradeoffs, and scores you when you're done.

42 problems. Pick one and go. Covers every major pattern — URL shorteners to distributed databases. Each problem has a study guide so you can learn before you practice.

Two modes. Practice mode walks you through it together. Interview mode doesn't help — it pushes back, probes assumptions, and stays quiet when you're stuck. Just like the real thing.

Scored on 5 dimensions. Structure, clarity, tradeoff reasoning, handling pushback, and conciseness. Every session ends with a report card and specific feedback.

Pause and resume anytime. Mid-interview and need to stop? Pick up exactly where you left off.

2 problems a day. Done in 3 weeks. Reading doesn't stick. Talking through designs does. That's the whole idea.