Design Flash Sale Inventory · System Design Interview

Design Flash Sale InventoryDesign the reservation path for a sale where ten thousand units go on sale at a fixed time and a million people are waiting for it.What it has to do

Never sell more units than exist

A unit held for someone who does not pay goes back on sale

A buyer is told quickly whether they got one

Scale

Units in the sale: 10,000

People at the moment it opens: 1 million

Out of scope

Payment processing itself

Shipping and fulfilment

The product page

Fraud and bot detection

Practise this challengeAll system design challenges

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