Sébastien Eustace
Software Engineer at Alma
Greater Paris Metropolitan Region France
Summary
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Rockstar🎓
Top School
Top expert inComprehensive Python Ecosystem Development
Sébastien Eustace is a seasoned software engineer with 13 years of experience based in the Greater Paris area, best known as a proud pythonista and creator of the Poetry package manager and the Pendulum datetime library. He specializes in crafting elegant, user-friendly APIs and core library work, contributing deeply to projects like tomlkit, cleo, poetry-core and the Orator ORM. His background spans startups, freelance work, and product teams (including Alma and PeopleDoc), giving him a strong mix of product-facing and infrastructure-level expertise. A mathematician by training with an IT engineering and management master’s, he combines rigorous problem-solving with pragmatic engineering. Colleagues value him for improving developer experience and maintaining style-preserving tooling that keeps ecosystems interoperable.
13 years of coding experience
12 years of employment as a software developer
Bachelor of mathematics, Bachelor of mathematics at Université de Caen Basse NormandieMaster’s Degree in IT Engineering and Management, Master’s Degree in IT Engineering and Management at HETIC
Github Skills (30)
lib10
python10
testing10
packaging10
command-line-interface10
databases10
toml10
orm10
command-line10
build-tools10
pypi10
database10
cli10
datetime-parsing9
back-end-development9
Programming languages (2)
Github contributions (5)
python-poetry/cleo
Dec 2013 - May 2022
Cleo allows you to create beautiful and testable command-line interfaces.
Role in this project:
Back-end Developer
Back-end DeveloperContributions:27 releases, 297 commits, 44 PRs in 8 years 6 months
Contributions summary:Sébastien made several changes related to Python3 compatibility within the Cleo library, indicating work on core library functionality. The commits involved adapting code in the `test_dialog_helper.py`, `test_progress_helper.py`, `command_tester.py`, `application_tester.py`, and `stream_output.py` files to be compatible with Python 3 and adjusting for encoding issues. They also contributed to adding the `Table` helper class.
pythoncleosubcommandstestableinterfaces
python-poetry/poetry-core
Feb 2020 - Aug 2022
Poetry PEP 517 Build Backend & Core Utilities
Role in this project:Back-end Developer
Back-end DeveloperContributions:23 releases, 55 reviews, 157 commits in 2 years 6 months
Contributions summary:Sébastien primarily contributed to the core functionalities and utilities of the `poetry-core` library, as indicated by commits focused on adding methods to project packages and bumping the version. They also backported fixes from the main Poetry repository, showcasing an understanding of the project's overall architecture. The user further demonstrated expertise in build systems by setting up the continuous integration process, fixing vendoring issues, and integrating support for dependency groups.
pep517pythonpypypipackaging
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