System design interview question
"Design a food delivery platform. Customers order from restaurants, the restaurant cooks, and a courier picks it up and delivers it. You have to coordinate three independent parties who are all unreliable, and the food gets cold. 10 million orders a day."
three-sided marketplace coordination with a perishable good and a hard timing constraint. Unlike ride-hailing (two sides, immediate), here you must predict when the food will be ready and dispatch a courier to arrive at that moment — too early and the courier waits, too late and the food sits. The prediction-and-dispatch coupling is the heart of it.
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