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<title>Rangeet Pan – Research Scientist</title>
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<body>
<!-- ── Navigation ──────────────────────────────────────────────── -->
<nav>
<ul>
<li><a href="#about">About</a></li>
<li><a href="#awards">Awards</a></li>
<li><a href="#publications">Publications</a></li>
<li><a href="#service">Service</a></li>
<li><a href="#interns">Mentoring</a></li>
<li><a href="#news">News</a></li>
<li><a href="rangeet-CV-2026.pdf" target="_blank">CV</a></li>
</ul>
</nav>
<div class="page">
<!-- ── Hero ──────────────────────────────────────────────────── -->
<div class="hero">
<div class="hero-photo">
<img src="IMG_6488.png" alt="Rangeet Pan">
</div>
<div class="hero-info">
<h1>Rangeet Pan</h1>
<div class="title">Staff Research Scientist · IBM T.J. Watson Research Center</div>
<p>
My research is in software engineering, with a focus on program analysis and the application
of large language models to code-related tasks — including code translation, test generation,
and application modernization. I received my Ph.D. from Iowa State University.
</p>
<p>
For the latest updates, see my
<a href="https://research.ibm.com/people/rangeet-pan">IBM Research profile</a>.
</p>
<div class="hero-links">
<a href="https://scholar.google.com/citations?hl=en&user=w2vz7HoAAAAJ" target="_blank">Google Scholar</a>
<a href="https://github.com/rangeetpan" target="_blank">GitHub</a>
<a href="https://www.linkedin.com/in/rangeetpan/" target="_blank">LinkedIn</a>
<a href="https://twitter.com/rangeetpan" target="_blank">Twitter / X</a>
<a href="rangeet-CV-2026.pdf" target="_blank">Curriculum Vitae</a>
</div>
</div>
</div>
<!-- ── About ─────────────────────────────────────────────────── -->
<section id="about">
<h2>About</h2>
<p>
Rangeet Pan is a Staff Research Scientist at the IBM T.J. Watson Research Center, Yorktown Heights, NY.
His research interests span software engineering, program analysis, and large language models (LLMs).
</p>
<p>
At IBM Research, his work centers on incorporating program analysis with LLMs
for code-to-code tasks: code translation, automated test generation, and application modernization.
His test generation work is part of IBM's <em>watsonx Coding Assistant</em> product. He also developed
<a href="https://github.com/codellm-devkit/python-sdk">CLDK</a>, an open-source Python library for
contextualizing code LLMs with program analysis insights.
</p>
<p>
He received his Ph.D. in Computer Science from Iowa State University (2022). He holds an M.S.
in Computer and Systems Engineering from the University of Houston (2018).
</p>
</section>
<!-- ── Awards ────────────────────────────────────────────────── -->
<section id="awards">
<h2>Awards & Recognition</h2>
<ul class="awards-list">
<li><span class="award-year">2025</span> ACM SIGSOFT Distinguished Paper Award — ICSE 2025, Ottawa, Canada</li>
<li><span class="award-year">2024</span> Pat Goldberg Award (Honorable Mention) — IBM Research</li>
<li><span class="award-year">2021</span> Research Excellence Award — Iowa State University</li>
<li><span class="award-year">2020</span> ACM SIGSOFT Distinguished Paper Award — ESEC/FSE 2020</li>
<li><span class="award-year">2020</span> 2nd Place, ACM Student Research Competition — ICSE 2020</li>
<li><span class="award-year">2020</span> Robert Stewart Early Research Recognition Award — Iowa State University</li>
<li><span class="award-year">2019</span> ACM Travel Award — ESEC/FSE 2019, Tallinn, Estonia</li>
<li><span class="award-year">2017</span> Merit Scholarship, Phi Beta Delta — University of Houston</li>
</ul>
</section>
<!-- ── Publications ──────────────────────────────────────────── -->
<section id="publications">
<h2>Publications</h2>
<!-- 2026 -->
<div class="pub-year-group">
<div class="pub-year-label">2026</div>
<ul class="pub-list">
<li class="pub-item">
<div class="pub-title">SAINT: Service-level Integration Test Generation with Program Analysis and LLM-based Agents</div>
<div class="pub-authors"><strong>Rangeet Pan</strong>, Raju Pavuluri, Ruikai Huang, Rahul Krishna, Tyler Stennett, Alessandro Orso, and Saurabh Sinha</div>
<div class="pub-venue">ICSE 2026 — IEEE/ACM 48th International Conference on Software Engineering</div>
</li>
<li class="pub-item">
<div class="pub-title">Hamster: A Large-Scale Study and Characterization of Developer-Written Tests</div>
<div class="pub-authors"><strong>Rangeet Pan</strong>, Tyler Stennett, Raju Pavuluri, Nate Levin, Alessandro Orso, and Saurabh Sinha</div>
<div class="pub-venue">ICSE-SEIP 2026 — Software Engineering in Practice</div>
</li>
<li class="pub-item">
<div class="pub-title">Sakura: An Approach for Generating Complex Tests from Natural Language Test Descriptions</div>
<div class="pub-authors">Tyler Stennett, <strong>Rangeet Pan</strong>, Bridget McGinn, Alessandro Orso, and Saurabh Sinha</div>
<div class="pub-venue">ISSTA, 2026</div>
</li>
</ul>
</div>
<!-- 2025 -->
<div class="pub-year-group">
<div class="pub-year-label">2025</div>
<ul class="pub-list">
<li class="pub-item">
<div class="pub-title">ASTER: Natural and Multi-language Unit Test Generation with LLMs</div>
<div class="pub-authors"><strong>Rangeet Pan</strong>, Myeongsoo Kim, Rahul Krishna, Raju Pavuluri, and Saurabh Sinha</div>
<div class="pub-venue">ICSE-SEIP 2025<span class="pub-badge">ACM SIGSOFT Distinguished Paper</span></div>
<div class="pub-links">
<a href="https://research.ibm.com/blog/aster-llm-unit-testing" target="_blank">Paper / Blog</a>
</div>
</li>
<li class="pub-item">
<div class="pub-title">AlphaTrans: A Neuro-Symbolic Compositional Approach for Repository-Level Code Translation and Validation</div>
<div class="pub-authors">Ali Reza Ibrahimzada, Kaiyao Ke, Mrigank Pawagi, Muhammad Salman Abid, <strong>Rangeet Pan</strong>, Saurabh Sinha, and Reyhaneh Jabbarvand</div>
<div class="pub-venue">FSE 2025 — Proceedings of the ACM on Software Engineering</div>
<div class="pub-links">
<a href="https://alirezai.cs.illinois.edu/assets/pdf/alphatrans.pdf" target="_blank">PDF</a>
</div>
</li>
<li class="pub-item">
<div class="pub-title">Codellm-Devkit: A Framework for Contextualizing Code LLMs with Program Analysis Insights</div>
<div class="pub-authors">Rahul Krishna, <strong>Rangeet Pan</strong>, Saurabh Sinha, Srikanth Tamilselvam, Raju Pavuluri, and Maja Vukovic</div>
<div class="pub-venue">ASE 2025 — ACM International Conference on the Foundations of Software Engineering</div>
<div class="pub-links">
<a href="https://arxiv.org/pdf/2410.13007" target="_blank">PDF</a>
</div>
</li>
<li class="pub-item">
<div class="pub-title">Codellm-Devkit: A Framework for Contextualizing Code LLMs with Program Analysis Insights — Tool Demo</div>
<div class="pub-authors">Rahul Krishna, <strong>Rangeet Pan</strong>, Raju Pavuluri, Maja Vukovic, and Saurabh Sinha</div>
<div class="pub-venue">ICSE 2025 — Demo Track</div>
<div class="pub-links">
<a href="https://github.com/codellm-devkit/python-sdk" target="_blank">GitHub</a>
</div>
</li>
<li class="pub-item">
<div class="pub-title">Otter: Generating Tests from Issues to Validate SWE Patches</div>
<div class="pub-authors">Toufique Ahmed, Jatin Ganhotra, <strong>Rangeet Pan</strong>, Avraham Shinnar, Saurabh Sinha, and Martin Hirzel</div>
<div class="pub-venue">ICLR 2025 — Forty-second International Conference on Machine Learning</div>
<div class="pub-links">
<a href="https://arxiv.org/pdf/2502.05368" target="_blank">PDF</a>
</div>
</li>
</ul>
</div>
<!-- 2024 -->
<div class="pub-year-group">
<div class="pub-year-label">2024</div>
<ul class="pub-list">
<li class="pub-item">
<div class="pub-title">Lost in Translation: A Study of Bugs Introduced by Large Language Models while Translating Code</div>
<div class="pub-authors"><strong>Rangeet Pan</strong>, Ali Reza Ibrahimzada, Rahul Krishna, Divya Sankar, Lambert Pouguem Wassi, Michele Merler, Boris Sobolev, Raju Pavuluri, Saurabh Sinha, and Reyhaneh Jabbarvand</div>
<div class="pub-venue">ICSE 2024</div>
<div class="pub-links">
<a href="https://dl.acm.org/doi/10.1145/3597503.3639226" target="_blank">ACM DL</a>
</div>
</li>
</ul>
</div>
<!-- 2023 -->
<div class="pub-year-group">
<div class="pub-year-label">2023</div>
<ul class="pub-list">
<li class="pub-item">
<div class="pub-title">Towards Supporting Universal Static Analysis using WALA</div>
<div class="pub-authors"><strong>Rangeet Pan</strong>, Rahul Krishna, Divya Sankar, Saurabh Sinha, Julian Dolby, and Raju Pavuluri</div>
<div class="pub-venue">PLDI Tutorial 2023</div>
</li>
<li class="pub-item">
<div class="pub-title">Decomposing a Recurrent Neural Network into Modules for Enabling Reusability and Replacement</div>
<div class="pub-authors">Sayem Imtiaz, Fraol Batole, Astha Singh, <strong>Rangeet Pan</strong>, Breno Dantas Cruz, and Hridesh Rajan</div>
<div class="pub-venue">ICSE 2023</div>
</li>
</ul>
</div>
<!-- 2022 -->
<div class="pub-year-group">
<div class="pub-year-label">2022</div>
<ul class="pub-list">
<li class="pub-item">
<div class="pub-title">Decomposing Convolutional Neural Networks into Reusable and Replaceable Modules</div>
<div class="pub-authors"><strong>Rangeet Pan</strong> and Hridesh Rajan</div>
<div class="pub-venue">ICSE 2022</div>
</li>
<li class="pub-item">
<div class="pub-title">Manas: Mining Software Repositories to Assist AutoML</div>
<div class="pub-authors">Giang Nguyen, Md Johirul Islam, <strong>Rangeet Pan</strong>, and Hridesh Rajan</div>
<div class="pub-venue">ICSE 2022</div>
</li>
</ul>
</div>
<!-- 2021 -->
<div class="pub-year-group">
<div class="pub-year-label">2021</div>
<ul class="pub-list">
<li class="pub-item">
<div class="pub-title">Can Program Synthesis be Used to Learn Merge Conflict Resolutions? An Empirical Analysis</div>
<div class="pub-authors"><strong>Rangeet Pan</strong>, Vu Le, Nachiappan Nagappan, Sumit Gulwani, Shuvendu Lahiri, and Mike Kaufman</div>
<div class="pub-venue">ICSE 2021</div>
<div class="pub-links">
<a href="https://arxiv.org/pdf/2103.02004.pdf" target="_blank">Pre-print</a>
<a href="https://www.youtube.com/watch?v=Udsf9k20vbE" target="_blank">Video</a>
<a href="https://www.microsoft.com/en-us/research/blog/safe-program-merges-at-scale-a-grand-challenge-for-program-repair-research/" target="_blank">MSR Blog</a>
</div>
</li>
</ul>
</div>
<!-- 2020 -->
<div class="pub-year-group">
<div class="pub-year-label">2020</div>
<ul class="pub-list">
<li class="pub-item">
<div class="pub-title">On Decomposing a Deep Neural Network into Modules</div>
<div class="pub-authors"><strong>Rangeet Pan</strong> and Hridesh Rajan</div>
<div class="pub-venue">ESEC/FSE 2020<span class="pub-badge">ACM SIGSOFT Distinguished Paper</span></div>
<div class="pub-links">
<a href="https://dl.acm.org/doi/10.1145/3368089.3409668" target="_blank">ACM DL</a>
</div>
</li>
<li class="pub-item">
<div class="pub-title">Does Fixing Bug Increase Robustness in Deep Learning?</div>
<div class="pub-authors"><strong>Rangeet Pan</strong></div>
<div class="pub-venue">ICSE SRC 2020 · <em>2nd Place, Student Research Competition</em></div>
<div class="pub-links">
<a href="https://dl.acm.org/doi/10.1145/3377812.3382175" target="_blank">ACM DL</a>
</div>
</li>
<li class="pub-item">
<div class="pub-title">Repairing Deep Neural Networks: Fix Patterns and Challenges</div>
<div class="pub-authors">Md Johirul Islam, <strong>Rangeet Pan</strong>, and Hridesh Rajan</div>
<div class="pub-venue">ICSE 2020</div>
<div class="pub-links">
<a href="https://dl.acm.org/doi/10.1145/3377811.3380378" target="_blank">ACM DL</a>
</div>
</li>
</ul>
</div>
<!-- 2019 -->
<div class="pub-year-group">
<div class="pub-year-label">2019</div>
<ul class="pub-list">
<li class="pub-item">
<div class="pub-title">A Comprehensive Study on Deep Learning Bug Characteristics</div>
<div class="pub-authors">Md Johirul Islam, Giang Nguyen, <strong>Rangeet Pan</strong>, and Hridesh Rajan</div>
<div class="pub-venue">ESEC/FSE 2019</div>
<div class="pub-links">
<a href="https://dl.acm.org/doi/abs/10.1145/3338906.3338955" target="_blank">ACM DL</a>
</div>
</li>
<li class="pub-item">
<div class="pub-title">Static Deep Neural Network Analysis for Robustness</div>
<div class="pub-authors"><strong>Rangeet Pan</strong></div>
<div class="pub-venue">ESEC/FSE SRC 2019</div>
<div class="pub-links">
<a href="https://dl.acm.org/doi/10.1145/3338906.3342502" target="_blank">ACM DL</a>
</div>
</li>
</ul>
</div>
</section>
<!-- ── Service ────────────────────────────────────────────────── -->
<section id="service">
<h2>Professional Service</h2>
<ul class="service-list">
<li>Program Committee Member, FSE Research Track, 2027</li>
<li>Program Committee Member, ICSE Research Track, 2026</li>
<li>Co-Chair, ReCode Workshop, ICSE 2026</li>
<li>Program Committee Member, ICSE NIER Track, 2026</li>
<li>Program Committee Member, ICSE Research Track, 2025</li>
<li>Program Committee Member, ICSE SEIP Track, 2024</li>
<li>Program Committee Member, ASE Research Track, 2024</li>
<li>Program Committee Member, ESEC/FSE Research Track, 2023</li>
<li>Program Committee Member, OOPSLA Artifact Track, 2021</li>
<li>Shadow Program Committee Member, MSR 2021</li>
<li>Web Chair & Organizing Committee, SPLASH 2020 & 2021</li>
<li>External Reviewer, IEEE Transactions on Software Engineering (TSE)</li>
<li>External Reviewer, ACM Transactions on Software Engineering and Methodology (TOSEM)</li>
<li>External Reviewer, Springer Empirical Software Engineering (EMSE)</li>
</ul>
</section>
<!-- ── Mentoring ──────────────────────────────────────────────── -->
<section id="interns">
<h2>Mentoring</h2>
<ul class="intern-list">
<li><strong>Tyler Stennett</strong> — Summer 2025 and 2026, Georgia Tech</li>
<li><strong>Shuyang Liu</strong> — Summer 2025, UIUC</li>
<li><strong>Myeongsoo Kim</strong> — Summer 2024, Georgia Tech · currently at Amazon Science</li>
<li><strong>Ali Reza Ibrahimzada</strong> — Summer 2023 and 2024, UIUC</li>
</ul>
</section>
<!-- ── News ──────────────────────────────────────────────────── -->
<section id="news">
<h2>Selected News</h2>
<ul class="news-list">
<li>
<span class="news-date">Apr 2025</span>
<span class="news-text">IBM Research Blog: <a href="https://research.ibm.com/blog/aster-llm-unit-testing" target="_blank">ASTER: Natural and multi-language unit test generation with LLMs</a></span>
</li>
<li>
<span class="news-date">Sep 2024</span>
<span class="news-text">IBM Research Blog: <a href="https://research.ibm.com/blog/cldk-codellm-devkit" target="_blank">Simplify your Code LLM solutions using CodeLLM DevKit</a></span>
</li>
<li>
<span class="news-date">Jun 2022</span>
<span class="news-text">Joined IBM Research as a Research Staff Member.</span>
</li>
<li>
<span class="news-date">Jun 2022</span>
<span class="news-text">Defended Ph.D. dissertation on decomposing deep learning models into modules.</span>
</li>
<li>
<span class="news-date">Aug 2021</span>
<span class="news-text">Microsoft Research Blog: <a href="https://www.microsoft.com/en-us/research/blog/safe-program-merges-at-scale-a-grand-challenge-for-program-repair-research/" target="_blank">Safe program merges at scale</a></span>
</li>
<li>
<span class="news-date">May 2021</span>
<span class="news-text">Awarded Research Excellence Award by the Department of Computer Science, Iowa State University.</span>
</li>
<li>
<span class="news-date">Nov 2020</span>
<span class="news-text">ACM SIGSOFT Distinguished Paper Award at ESEC/FSE 2020 for "On Decomposing Deep Neural Networks into Modules."</span>
</li>
<li>
<span class="news-date">May 2020</span>
<span class="news-text">2nd Place at the ACM Student Research Competition, ICSE 2020.</span>
</li>
<li>
<span class="news-date">May 2020</span>
<span class="news-text">Joined Microsoft Research as a Research Intern.</span>
</li>
</ul>
</section>
</div><!-- /.page -->
<footer>
<p>Rangeet Pan · IBM T.J. Watson Research Center, Yorktown Heights, NY</p>
</footer>
</body>
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