// Hacker Noon · 10 April 2026

How DoorDash Optimized Item Availability at Scale Using Elasticsearch

DoorDash's homepage item carousels needed to filter millions of items by availability in under 300ms. We couldn't call the menu service at request time (too much fan-out, too slow), so we indexed availability directly in Elasticsearch. We went through three schema iterations: nested documents (600ms...

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@hacker-noon · Ujjwal Gulecha

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