Worked on Stirling-PDF to deliver a user preferences feature that allows customization of the default startup view and PDF reader zoom, streamlining the reading experience by reducing repetitive manual actions. The implementation involved introducing new TypeScript types and updating React components to ensure type safety and maintain accessibility within modal dialogs. Changes were made to the General settings UI, with localization support added for en-GB translations. The approach prioritized stability by preserving existing defaults, minimizing risk for current users. This work leveraged JavaScript, TypeScript, and front end development skills to enhance onboarding, retention, and productivity for power users.