Jeffery Tolmie contributed to both PrismLauncher/PrismLauncher and ente-io/ente, focusing on targeted feature enhancements and UI improvements. For PrismLauncher, he refined mod discovery by aligning client and server filter logic with Modrinth, improving ModFilterWidget state handling, and updating default side logic, using C++ and backend development skills. He also ensured governance compliance by updating DCO sign-offs. In ente-io/ente, Jeffery addressed dark mode UI consistency by fixing transparency rendering for the Realme icon, leveraging JavaScript and CSS for front end development. His work demonstrated thoughtful problem-solving and attention to maintainability, resulting in cleaner user experiences and reduced support needs.