Longfei Yun is a skilled software engineer currently working at Meta since May 2025, focusing on Facebook Feed Ranking. Prior to this role, Longfei contributed as an applied scientist at Amazon from June to September 2024 and served as a research assistant at both the Halıcıoğlu Data Science Institute at UC San Diego and Tsinghua University, where research efforts included the tradeoff between training performance and inference cost for Mixture-of-Experts models and occupancy perception for autonomous driving, respectively. Presently, Longfei is also a research assistant in the Computer Science and Engineering Department at UC San Diego, investigating the diversity collapse of large language models and fine-grained conditional generation, with publications planned for EMNLP 25. Longfei holds a Master’s degree in Computer Science from UC San Diego and a Bachelor’s degree in Computer Software Engineering from Tsinghua University.
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