Mathieu Kniewallner
Senior Software Engineer at Back Market
Bordeaux, Nouvelle-Aquitaine, France
Summary
🤩
Rockstar🎓
Top SchoolMathieu Kniewallner is a Senior Software Engineer with 11 years of experience focused on Developer Experience, CI/CD, automation, and Python packaging, based in Bordeaux, France. At Back Market he streamlined monolith deployments, sped startup time from 8s to 2s, migrated CI to CircleCI, and introduced Renovate company-wide to automate dependency updates. An active open-source contributor, he has improved widely used projects like Poetry (packaging/installer fixes) and Renovate (support for Poetry, pip-compile, uv), and contributed security-focused rules to the fast Rust linter Ruff. He blends hands-on backend development (Python and Rust ecosystems) with DevOps sensibilities, routinely refactoring for type safety, deprecation handling, and canonicalization. Known for evangelizing clear code ownership and developer tooling, he also has a track record of making projects ARM-compatible and improving developer onboarding and bootstrapping.
11 years of coding experience
8 years of employment as a software developer
Institute of technology, Computer Science, Institute of technology, Computer Science at Université de Versailles Saint-Quentin-en-YvelinesEngineer’s Degree, Computer Science, Engineer’s Degree, Computer Science at ESGI
French, English
Github Skills (36)
dependency-manager10
dependency-management10
debugging10
debug10
static-analysis10
pytest10
package-management10
python10
dependency-analysis10
uvm10
testing10
command-line-interface10
packaging10
python-poetry10
security10
Programming languages (17)
Github contributions (5)
python-poetry/poetry-core
May 2022 - Oct 2022
Poetry PEP 517 Build Backend & Core Utilities
Role in this project:
Back-end Developer
Back-end DeveloperContributions:47 reviews, 29 commits, 20 PRs in 5 months
Contributions summary:Mathieu contributed to the core functionalities of the poetry-core project, a Python packaging and build tool. Their work involved refactoring code to comply with mypy type checking, and addressing issues related to wheel name normalization, and factory configurations. The user also made improvements to the testing framework, including the integration tests using the repository itself. Additionally, they updated dependencies and fixed issues to ensure project's stability and compatibility.
pep517pythonpypypipackaging
python-poetry/poetry
Aug 2021 - Nov 2022
Python packaging and dependency management made easy
Role in this project:Back-end Developer
Back-end DeveloperContributions:153 reviews, 73 commits, 76 PRs in 1 year 2 months
Contributions summary:Mathieu primarily contributed to improving the Poetry package manager. Their commits focused on fixing bugs related to the installation process by checking for return codes in subprocesses. They also refactored code, addressing deprecation warnings in commands, removing unnecessary maps, and ensuring garbage collection of objects using lru cache. In addition, they introduced changes to support canonicalization of package names within the CLI.
pythonpackagingpackage-managerdependency-managementpython-packaging
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