Jiajun Hu
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ABOUT

Experience

2024.4 — Present
Researcher, Huawei Hong Kong Research Center

My work focuses on reward modeling for code LLMs and coding agents, including training scalar reward models based on the Bradley–Terry model for code training data selection, and developing generalist reward models for coding-agent verification.

Education

2016.9 — 2024.1
Ph.D. in Computer Science, The Hong Kong University of Science and Technology

Under the supervision of Prof. Shing-Chi Cheung, my PhD research focused on Android hybrid programming, including empirical studies of cross-language bugs induced by WebViews and the development of bug detection techniques based on static and dynamic program analysis.

2012.9 — 2016.7
B.Eng. in Software Engineering, Yangzhou University

Under the supervision of Prof. Xiaobing Sun, my undergraduate research focused on software evolution and comprehension, leveraging unsupervised NLP techniques based on topic modeling to uncover patterns in software development histories.

Research interests

Reward Models · Post-Training · Coding LLMs and Agents · Data Curation · Software Engineering

WRITING

Blog

Notes on papers, research ideas, and things I'm learning.

Oct 14, 2026

Reinforcement Learning of Large Language Models via Policy Gradient Methods (Being Drafted)

paper notesreinforcement learning

RESEARCH

Selected Papers

A selection of publications and ongoing work.

SWE-Critix: Post-Training Generalist Verifiers for Assessing Coding-Agent Trajectories

Jiajun Hu, Chun Yong Chong

arXiv, 2026

PaperCode

ωTest: WebView-Oriented Testing for Android Applications

Jiajun Hu, Lili Wei, Yepang Liu, Shing-Chi Cheung

32nd ACM SIGSOFT International Symposium on Software Testing and Analysis (ISSTA 2023), 2023

PaperCode

A Tale of Two Cities: How WebView Induces Bugs to Android Applications

Jiajun Hu, Lili Wei, Yepang Liu, Shing-Chi Cheung, Huaxun Huang

33rd ACM/IEEE International Conference on Automated Software Engineering (ASE 2018), 2018

Paper

Modeling the Evolution of Development Topics Using Dynamic Topic Models

Jiajun Hu, Xiaobing Sun, David Lo, Bin Li

22nd International Conference on Software Analysis, Evolution, and Reengineering (SANER 2015), 2015

Paper

Explore the Evolution of Development Topics via On-Line LDA

Jiajun Hu, Xiaobing Sun, Bin Li

22nd International Conference on Software Analysis, Evolution, and Reengineering (SANER 2015), 2015

Paper

Empirical Studies on the NLP Techniques for Source Code Data Preprocessing

Xiaobing Sun, Xiangyue Liu, Jiajun Hu, Junwu Zhu

3rd International Workshop on Evidential Assessment of Software Technologies (EAST 2014), 2014

Paper
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