Over a two-month period, this developer contributed to both the jellyfin-web and jellyfin-desktop repositories, focusing on front end development, localization, and audio/video player enhancements using JavaScript and JSON. For jellyfin-web, they improved the Polish user experience by updating UI translations through Weblate, ensuring accuracy and traceability without altering application logic. In jellyfin-desktop, they addressed persistent audio volume issues by refactoring volume control and integrating appSettings, which centralized volume management and improved maintainability. Additionally, they enhanced accessibility in Uptime Kuma by adding Polish localization. Their work emphasized reliability, maintainability, and user experience across multilingual and media-rich applications.