Junjielong Xu

Junjielong Xu

Ph.D. candidate at CUHK-SZ



Junjielong Xu is a Ph.D. candidate of Computer Science in the School of Data Science at The Chinese University of Hong Kong, Shenzhen (CUHK-SZ). His supervisor is Pinjia He. Currently, he is a visiting scholar in AST Lab, ETH Zurich, mentored by Zhendong Su. Before joining CUHK-SZ, he received his BEng degree from the School of Electronic Information and Communication at Huazhong University of Science and Technology (HUST) in 2022.

🔎 His research focuses on LLM-based DevOps automation for enhancing reliability of code and services. He is also interested in recent LLM research topics such as scalable oversight, reinforcement learning, and test-time scaling.

🔑 His objective is to provide non-trivial insights into AI models to address impactful challenges in real-world SE scenarios. He is trying hard to work toward this and hopes to conduct interesting yet meaningful research one day. 🫨

P.S. My name “Junjielong Xu” is written as “徐俊杰龙” in Chinese, and is pronounced like “Joon-jyeh-long Shoo.”

🔥 News

  • 2025.10:  🎉🎉 I started my research visit in AST Lab, ETH Zurich.
  • 2025.09:  🎉🎉 One collaborative paper with ByteDance was accepted by NeurIPS’25 (Spotlight).
  • 2025.04:  🎉🎉 I started my internship in Trae Research, ByteDance.（筋斗云人才计划 ）
  • 2025.03:  🎉🎉 I served as Art Design Chair for FSE’26.
  • 2025.01:  🎉🎉 I served as Program Committee for FSE’25 industry track.
  • 2025.01:  🎉🎉 One first-authored paper was accepted by ICLR’25.
  • 2024.10:  🎉🎉 One first-authored paper was accepted by ICSE’25.
  • 2024.03:  🎉🎉 I served as Shadow Program Committee for ICSE’25.

📝 Publications

  •   arXiv  AL-Bench: A Benchmark for Automatic Logging

    Boyin Tan, Junjielong Xu*, Zhouruixing Zhu, Pinjia He.

    arXiv prepreint, 2025.

    [paper] [code]

  •   NeurIPS’25  Repo2Run: Automated Building Executable Environment for Code Repository at Scale

    Ruida Hu, Chao Peng, XinchenWang, Junjielong Xu, Cuiyun Gao

    Annual Conference on Neural Information Processing Systems, San Diego, Dec 2025.

    [paper] [code]

  •   ICLR’25  OpenRCA: Can Large Language Models Locate the Root Cause of Software Failures?

    Junjielong Xu, Qinan Zhang, Zhiqing Zhong, Shilin He, Chaoyun Zhang, Qingwei Lin, Dan Pei, Pinjia He, Dongmei Zhang, Qi Zhang.

    International Conference on Learning Representations, Singapore, April 2025.

    [paper] [code]

  •   ICSE’25  Aligning the Objective of LLM-based Program Repair

    Junjielong Xu, Ying Fu, Shin Hwei Tan, Pinjia He.

    International Conference on Software Engineering, Ottawa, April 2025.

    [paper] [code]

  •   ICSE’24  DivLog: Log Parsing with Prompt Enhanced In-Context Learning

    Junjielong Xu, Ruichun Yang, Yintong Huo, Chengyu Zhang, Pinjia He.

    International Conference on Software Engineering, Lisbon, April 2024.

    [paper] [code]

  •   ICSE’24  UniLog: Automatic Logging via LLM and In-Context Learning

    Junjielong Xu, Ziang Cui, Yuan Zhao, Xu Zhang, Shilin He, Pinjia He, Liqun Li, Yu Kang, Qingwei Lin, Yingnong Dang, Saravan Rajmohan, Dongmei Zhang

    International Conference on Software Engineering, Lisbon, April 2024.

    [paper] [code]

  •   FSE’23  Hue: A User-Adaptive Parser for Hybrid Logs

    Junjielong Xu, Qiuai Fu, Zhouruixing Zhu, Yutong Cheng, Zhijing Li, Yuchi Ma, Pinjia He.

    International Conference on the Foundations of Software Engineering, San Francisco, December 2023.

    [paper] [code]

🎖 Honors and Awards

  • 2024.04 💰Duan Yong Ping Travel Award, CUHK-Shenzhen (¥10,000)
  • 2023.12 🥉3rd Prize, CCF International AIOps Challenge (Ranked 🏅1st among student teams)
  • 2020.10 🏅1st Prize, China Undergraduate Mathematical Contest in Modeling (CUMCM) (🤺Leader)
  • 2020.04 🏆Finalist Prize, Mathematical Contest In Modeling (MCM) (🤺Solo)

💬 Service

Journal

Conference

  • Art Design Chair: FSE’26
  • Program Committee: ISSRE’26 (research-track), FSE’25 (industry-track), ICSE’25 (shadow-PC)
  • Artifact Evaluation Committee: ICSE’25, ISSRE’24
  • Reviewer: ICLR’26

💻 Internships

  • 2025.04 - (now), ByteDance Trae IDE, researcher.
  • 2023.12 - 2024.09, Microsoft DKI Team, researcher.
  • 2023.05 - 2023.09, Huawei Cloud PaaS Lab, researcher.
  • 2021.06 - 2021.08, Tencent IEG User Platform, engineer.

📖 Educations

  • 2025.10 - (now), Academic guest in AST Lab, ETH Zurich.
  • 2022.09 - (now), Ph.D. in Computer Science, The Chinese University of Hong Kong, Shenzhen.
  • 2018.09 - 2022.06, B.Eng. in Electronic Information Engineering, Huazhong University of Science and Technology.

📐 Teaching

Teaching Assistant @CUHK-SZ

  • 2025.02 - CSC4001 Software Engineering
  • 2024.09 - CSC1001 Python Programming
  • 2024.02 - CSC4001 Software Engineering
  • 2023.02 - CSC4001 Software Engineering
  • 2022.09 - CSC1003 Java Programming

📉 Statistics

  • Highest stars for a repo: GitHub Repo stars
  • Most rejections for a paper: Static Badge