Contributed to the shaka-project/shaka-player repository by delivering targeted improvements in JavaScript-based front end development and UI/UX design. Developed a visibility-based caption rendering control that adapts to device-specific behaviors, ensuring captions display reliably across browsers and platforms while maintaining accessibility. Addressed a critical stability issue in DRM workflows by implementing a guard to prevent uncaught TypeErrors during player teardown, reducing crash exposure and support overhead. Collaborated cross-functionally to co-author changes, updated configuration logic, and maintained clear commit messaging for future maintainability. The work demonstrated a focus on reliability, device compatibility, and user experience through precise, maintainable code enhancements.