Guilhem Vallat developed a feature for the slint-ui/slint repository that enables loading and saving of global object properties within the Slint Viewer. Using Rust and back end development skills, Guilhem implemented end-to-end persistence for global object properties, addressing a key issue in data handling and session consistency. The solution improved the workflow for loading and saving data, allowing the viewer to maintain property states across sessions and enhancing overall reliability. Although the work focused on a single feature over one month, it demonstrated depth in understanding Rust and back end architecture, contributing to a more robust user experience in Slint.