Jérôme Kieffer
Software Engineer at ESRF
Grenoble, Auvergne-Rhône-Alpes, France
Summary
🤩
Rockstar🎓
Top SchoolJérôme Kieffer is a software engineer with 14 years of experience specializing in real-time online data analysis for scientific beamlines, turning high-frequency area-detector images into actionable 1D spectra at acquisition speed. With a PhD in chemistry and a background in crystallography and computational chemistry, he bridges domain science and applied math to design and parallelize algorithms that meet strict real-time constraints. He implements these algorithms in performant libraries and acquisition chains, drawing on low-level optimizations and multithreading experience evidenced by contributions to Cython and h5py. His open-source work includes performance and compatibility fixes in widely used projects like h5py, Cython, and NumPy tests, reflecting a pragmatic focus on reliability and interoperability. Based in Grenoble, he excels at translating beamline scientists’ needs into production-grade code and often tackles subtle datatype and concurrency issues that others overlook.
14 years of coding experience
Master, Chimie Physique, Master, Chimie Physique at École Normale supérieure de CachanDoctorat (PhD), Chimie, Doctorat (PhD), Chimie at Université Joseph Fourier (Grenoble I)
English
Github Skills (17)
hdf10
c-language10
datatypes10
python10
testing10
numpy10
performance-optimization10
cython10
cprogramming-language10
test-automation10
cpython-extensions9
pytest9
c119
c179
cpp8
Programming languages (10)
Github contributions (5)
h5py/h5py
Jan 2013 - Oct 2020
HDF5 for Python -- The h5py package is a Pythonic interface to the HDF5 binary data format.
Role in this project:
Back-end Developer
Back-end DeveloperContributions:131 commits, 21 PRs, 10 pushes in 7 years 10 months
Contributions summary:Jérôme primarily contributed to the h5py project by merging updates from the upstream repository and addressing code issues related to data type conversions. Their commits involved modifying the codebase to ensure compatibility with Cython 3 and Python 3, updating the numpy cimport, and refactoring code. The user also made changes to tests, addressing float-related issues and correcting type mappings.
h5pybinary-datapythondata-formathdf5
cython/cython
Feb 2012 - Jan 2020
The most widely used Python to C compiler
Role in this project:Back-end Developer
Back-end DeveloperContributions:12 commits, 2 PRs, 15 comments in 8 years
Contributions summary:Jérôme primarily worked on optimizing Cython code for performance and adding features to the standard library implementations. Their contributions involved adding the "nogil" keyword to various methods within the `libcpp` C++ standard library bindings to improve thread safety and performance. The changes included modifications across multiple `.pxd` files, indicating a focus on low-level code and integration with C++ libraries. They also added a test case for a complex number library.
cpython-extensionscpppythonpython-bindingsbig-data
Find and Hire Top DevelopersWe’ve analyzed the programming source code of over 60 million software developers on GitHub and scored them by 50,000 skills. Sign-up on Prog,AI to search for software developers.