Etsy Engineering8 min readOct 13, 2025

Understanding Etsy’s Vast Inventory with LLMs

For more than 20 years, Etsy has been the destination for human creativity online. Our marketplace is home to more than 100 million special items made, handpicked and designed by more than 5 million s

LLMsInventory ManagementMarketplace

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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...

Etsy Engineering11 min18d ago

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

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Understanding Etsy’s Vast Inventory with LLMs

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

Migrating Etsy’s database sharding to Vitess

How Etsy Uses LLMs to Improve Search Relevance