Webhook delivery
Design webhook delivery for a small app that lets customers register a URL to be notified when an event happens (e.g. an order is placed). When an event fires, you POST it to the customer's URL. Customer endpoints are sometimes slow or temporarily down. Volume is modest. Describe how you deliver reliably without blocking your own app and what you do when a customer's endpoint fails.
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.
Clarify3:30 left
Estimate3:30 planned
Design10:00 planned
Deep dive8:00 planned
Failure5:00 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.