Amandine Sahl focused on backend reliability improvements for the PnX-SI/GeoNature repository, addressing a critical bug in user-scoped data filtering. She enhanced the filter_by_scope function to default to the current user from the global context when the user parameter is omitted, ensuring accurate scope filtering in implicit-user scenarios. This change improved data accuracy and security for multi-user environments by reducing the risk of mis-filtering. Working primarily with Python and leveraging her skills in backend development and database management, Amandine maintained clear traceability by linking her fix to a specific commit, demonstrating careful attention to detail and robust engineering practices.