Yangfan Hu

I am Yangfan Hu (胡洋凡, pronounced like “Youngfan Hugh”), a master’s student in Computer Sciences at the School of Computer, Data & Information Sciences, University of Wisconsin-Madison. My current interests are in trustworthy machine learning and large language model safety, with a broader background in systems programming and backend infrastructure. Recently, I have been working closely with Jiawen Zhang, Haoyue Bai and Professor Jiawei Zhang.

Before coming to Madison, I worked as a game server engineer at miHoYo/HoYoverse, where I built backend systems in C++20 for large-scale online games. I received my B.E. in Software Engineering from the College of Computer Science and Technology, Zhejiang University.

Education

M.S. in Computer Sciences, University of Wisconsin-Madison, 2025-present.
B.E. in Software Engineering, Zhejiang University, 2018-2022.

Employment

Game Server Engineer, miHoYo/HoYoverse, Shanghai, 2022-2025.
Java Software Engineer Intern, Alibaba Group, Hangzhou, 2021.

News

Apr 10, 2026	Our paper Understanding and Preserving Safety in Fine-Tuned LLMs was accepted to ACM CCS 2026.

Selected Publications

CCS

Understanding and Preserving Safety in Fine-Tuned LLMs

Jiawen Zhang, Yangfan Hu, Kejia Chen, and 7 more authors

2026

Accepted to ACM CCS 2026

arXiv Bib PDF

@misc{zhang2026understandingpreservingsafetyfinetuned,
  title = {Understanding and Preserving Safety in Fine-Tuned {LLMs}},
  author = {Zhang, Jiawen and Hu, Yangfan and Chen, Kejia and He, Lipeng and Ma, Jiachen and Lou, Jian and Li, Dan and Liu, Jian and Yang, Xiaohu and Jia, Ruoxi},
  year = {2026},
  note = {Accepted to ACM CCS 2026},
  archiveprefix = {arXiv},
  primaryclass = {cs.LG},
  url = {https://arxiv.org/abs/2601.10141},
}