Etsy Engineering12 min readOct 8, 2025

Unlocking Faster Insights with Experimenter-Defined Segmentations

Imagine you have a fabulous idea to drive more sales on Etsy by giving out free ice cream with every purchase. How would you know if it will actually work? One way to test this out is to run an experi

Data PipelineExperimentation/Testing

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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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Unlocking Faster Insights with Experimenter-Defined Segmentations

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