System design interview question
"Design the software that runs an Amazon fulfilment centre. Inventory arrives from suppliers, gets stowed somewhere in the building, and when an order comes in, workers or robots pick it, pack it, and ship it. One building holds millions of items and ships hundreds of thousands of packages a day."
software coordinating physical processes, where the state of the world is not something your database controls. The distinguishing content is: the system's model of reality is always slightly wrong, work must be assigned to constrained physical resources, and optimization (pick paths, stow locations) directly determines throughput.
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