Alexandre Prieto focused on improving code quality in the uclouvain/osis-admission repository by addressing import hygiene within the admissions module. He identified and removed unused imports from both template tags and view files, specifically targeting potential sources of import-related errors during template rendering and view execution. Using Python and Django, Alexandre applied disciplined code refactoring and import management practices to streamline the codebase, reducing maintenance risk and simplifying future development. His work enhanced the stability and maintainability of the module, demonstrating attention to detail and traceability through clear commit messages and hashes, though the scope was limited to a single targeted feature.