Peer-to-peer artifact distribution
Design a peer-to-peer file-transfer system (think a BitTorrent-style or WebRTC-datachannel-based distribution) for shipping large build artifacts (1–20 GB) to thousands of machines inside corporate networks, minimizing the load on a central origin. You need integrity guarantees, resumable transfers, and to work across NATs/firewalls. How do peers find each other, exchange chunks, and what's the central server still for?
What a strong answer looks like
Clarify scale and constraints first. Propose a clean component breakdown, then go deep on the hard parts (data model, bottlenecks, consistency, failure modes) and name the trade-offs you are making.
Clarify5:00 left
Estimate5:00 planned
Design15:00 planned
Deep dive12:00 planned
Failure8:00 planned
Which questions mattered is sealed until you submit. Telling you now would just be handing over the edge cases.
Run or narrate your approach, then ask the coach.