51. Design a Local Delivery Service like Gopuff
Show what 10,000 small warehouses can deliver within the hour in under 100 ms, and take multi-item orders without ever selling a unit twice.
ClassicMedium
Guided practice
Start with a template. Work through each step. Ask Coach when you need a second opinion.
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62. Design a Flash Sale System
Sell 10,000 units to a million people at noon with a lottery waiting room, a Redis gate before an Aurora ledger and holds that expire.
ClassicMedium87. Design a Hotel Booking System like Airbnb
Nights as counted inventory, holds that never double-book, search that knows availability, and payments that reconcile.
ClassicMedium