Etsy Engineering13 min readMar 20, 2026

Making Ads Count: Using MMoE and Auxiliary Tasks to Better Connect Buyers & Sellers

When buyers search on Etsy, they need to quickly and easily find the perfect item. At the same time, sellers need to be confident their unique products are being seen by the right customers. Our Ads S

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Migrating Etsy’s database sharding to Vitess

Etsy has maintained a sharded MySQL architecture since around 2010. This database cluster contains most of Etsy’s online data and is made up of ~1,000 tables...

Distributed SystemsDatabases

MySQLVitessKubernetesDatabase ShardingLarge Scale SystemMicroservicesDatabase Architecture

Etsy Engineering11 minJan 16, 2026

How Etsy Uses LLMs to Improve Search Relevance

Ever searched for something specific, only to be met with results that are close, but not quite? On Etsy’s Search Relevance team, that frustration is exactly...

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