Siqi Nie

Siqi Nie is currently the Director of Machine Learning at Unity, where they manage the Ads foundation modeling team, focusing on conversion modeling, market price modeling, creative optimization, and fraud detection. Previously, Siqi served as an Applied Science Manager at Amazon from 2022 to 2025, overseeing the all-stage prediction team responsible for conversion and early-stage click predictions for Amazon Ads. Before that role, Siqi was a Staff Machine Learning Engineer at Airbnb in 2021 and worked as a Research Scientist at Facebook from 2016 to 2021, specializing in machine learning applications in integrity environments with a focus on adversarial problems.