Architecture & LLD Preview

Food Delivery

Connect customers, restaurants, and delivery partners — order lifecycle plus partner assignment.

One Order aggregate holds two independent state machines — PreparationStatus and DeliveryStatus — with courier search starting the moment the kitchen begins cooking, reusing Cab Booking's exact candidate-cascade matching, and PICKED_UP gated on both machines aligning.

Core Design Challenge

"Design a food delivery system connecting customers, restaurants, and couriers. When do you start looking for a courier?"

What You'll Learn:

✦Real-time matching algorithms for drivers/riders and couriers
✦Dynamic surge pricing models based on supply and demand
✦Geospatial indexing and proximity coordinates search
✦Distributed transaction safety and payment settlement coordinates

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