Jean Hélie
Senior Research Engineer - AI4Science at Microsoft
Netherlands
Summary
🤩
Rockstar🎓
Top SchoolJean Hélie is a Senior Research Engineer at Microsoft Research Amsterdam with 12 years of experience building efficient deep learning solutions for computational chemistry and physics. Previously a senior ML engineer at GitHub after Semmle’s acquisition, he applied machine learning at scale to improve code security and contributed to high-profile open-source projects like CodeQL, Theano, NLTK and Matplotlib. He blends a strong academic foundation—a PhD in Biochemistry from Oxford and advanced engineering degrees from Cambridge and Ecole Centrale Lyon—with hands-on software craftsmanship, often improving maintainability and correctness in complex Python codebases. His work spans production ML, scientific computing, and security-focused dataflow analysis, reflecting a rare mix of domain science and practical engineering. Colleagues value him for quietly refactoring brittle systems into cleaner, safer code while advancing novel AI4Science methods.
11 years of coding experience
7 years of employment as a software developer
Doctor of Philosophy (PhD), Biochemistry, Doctor of Philosophy (PhD), Biochemistry at University of OxfordMPhil, Chemical Engineering, MPhil, Chemical Engineering at University of CambridgeDiplôme d'Ingénieur, Diplôme d'Ingénieur at Ecole Centrale Lyon
French, English, Spanish, Dutch
Github Skills (40)
data-visualizations10
github-advanced-security10
debug10
javascript10
dataflow10
cloud-computing10
python10
matplotlib10
it-security10
nltk10
analyse10
data-visualisation10
object-oriented-programming10
codeql10
numpy10
Programming languages (7)
Github contributions (5)
github/codeql
Mar 2022 - Jan 2023
CodeQL: the libraries and queries that power security researchers around the world, as well as code scanning in GitHub Advanced Security
Role in this project:
Backend Developer
Backend DeveloperContributions:65 reviews, 78 commits, 33 PRs in 10 months
Contributions summary:Jean contributed to a project related to security analysis with commits focused on integrating a new model for adaptive threat modeling. They modified files related to data flow analysis, particularly within Ruby and JavaScript code, and also updated test data. The changes indicate the user was involved in implementing and refining features related to XSS and shell command injection, potentially enhancing the project's ability to identify and mitigate security vulnerabilities. Furthermore, the user was also working on extraction and training data aspects.
github-advanced-securitysecurity-toolsgithub-security-labsecurity-researcherssecurity
apache/libcloud
May 2017 - Jul 2017
Apache Libcloud is a Python library which hides differences between different cloud provider APIs and allows you to manage different cloud resources through a unified and easy to use API.
Role in this project:Back-end Developer
Back-end DeveloperContributions:10 commits, 6 PRs, 5 comments in 1 month
Contributions summary:Jean primarily focused on improving the codebase's maintainability and correctness. Their contributions involved fixing bugs related to unreachable code, incorrect comparisons, and badly raised exceptions. They also removed redundant code elements like unnecessary `pass` statements and duplicate dictionary keys, leading to a cleaner and more efficient codebase. Moreover, the user addressed and reverted a change that touched on improving the logic in the existing codebase.
python-libraryapilibcloudpythonhides
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