Yunsong Guo is a staff ML engineer at Pinterest, researching and developing Homefeed Ranking models over the past 3.5 years. He is the founding member of the Homefeed ranking team and has led keys projects to turn Pinterest Homefeed ranking from time-based to logistic regression based, and later to GBDT and DNN powered ranking systems. Such projects and feature improvements resulted in more than 100% Homefeed user engagement gains, directly contributing to the over 200M monthly active users (MAUs) Pinterest has now. Prior to Pinterest, Yunsong obtained his PhD in Computer Science from Cornell University, and spent a few years working in London and Hong Kong on algorithmic trading, high frequency trading and statistical arbitrage using machine learned models.

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