Arthur Carvalho Sartori focused on stabilizing the UI asset pipeline for the Gustavo-Mitsuo87/Site-PW-Sony repository, addressing a critical issue where a missing image caused broken UI rendering. He identified and fixed the asset gap by validating image loading paths and ensuring rendering consistency across different environments. Working primarily with HTML and CSS, Arthur restored complete visual fidelity to the core screens, which improved the user experience and reduced potential support issues. While the scope of work was limited to a single bug fix over one month, his targeted debugging contributed to the overall stability and release readiness of the project.