Lilien worked on theme management and repository hygiene across several Osuny-based sites, including bonnepioche-site, levelesyeux-site, and cids-mids. She updated submodule references to newer theme commits, ensuring UI consistency and improved asset versioning. Using Git and submodule management, she excluded generated test data from version control by updating .gitignore files, which enhanced build reliability and maintainability. Her work focused on configuration and deterministic builds, pinning submodules to specific commits for reproducibility. While the changes did not introduce new features, they laid the groundwork for future UI updates and improved release traceability, reflecting a methodical approach to repository maintenance.