Xavier Chevalier focused on improving repository hygiene and developer experience for the incubateur-ademe/nosgestesclimat-site-nextjs project. He implemented documentation updates and tooling refinements, updating the README to clarify language and testing framework references while enhancing the .gitignore to exclude IDE-specific files. Using Git and Markdown, Xavier’s work streamlined onboarding for new contributors and aligned continuous integration and testing practices. These changes reduced repository noise, resulting in cleaner diffs and faster pull request reviews. Although the scope was limited to one feature over a month, the work demonstrated attention to maintainability and collaboration, with co-authored commit attribution supporting traceability.