Ticketmaster

How this question breaks down

1. 1Seat holdsCore30 minLet thousands of fans grab seats from the same map at once, give each seat to exactly one of them for a few minutes, and put it back on sale the moment that time runs out.
2. 2Waiting roomCore27 minHold millions of fans in a fair line in front of the shop, let them in at the rate the seat and checkout tier can serve, and tell everyone else early and honestly how long they will wait or that they won't get in.
3. 3BookingCore22 minTurn a seat hold into a paid order and real tickets exactly once, even when the card is slow, the hold is about to expire or the fan presses Pay twice.

Work through the parts in order and you’ve covered the full design. Each part is one topic.