Lily AI is a Mountain View-based retail AI company that translates the language of the customer into the language of the catalog. Its platform uses computer vision, NLP and large language models to enrich product data with thousands of consumer-centric attributes - powering site search, recommendations, SEO/SEM and demand forecasting for retailers like Macy's, Bloomingdale's, Gap and thredUP.
Matt Riley co-founded Swiftype (YC W12) in 2012, built it into a leading search-as-a-service platform, and sold it to Elastic in 2017. He then spent nearly eight years at Elastic as GVP & GM of Search, overseeing product, engineering, design, and developer relations for one of the world's most widely used search platforms. In late 2025, he returned to Y Combinator as a Visiting Partner - advising the next generation of founders using hard-won lessons from the full founder arc: zero to startup, startup to acquisition, acquisition to enterprise scale.