Worked on the mozilla/build-a-b repository to enhance user experience and reliability in front end workflows. Focused on improving card navigation and modal interactions by refining the CardCarousel for external card selection and updating modal layouts for better usability. Introduced owner-based logic to streamline modal behavior, ensuring the last played card is auto-selected for relevant users. Addressed cross-browser video playback issues by removing problematic attributes and implementing logic to force video reloads, particularly improving reliability in Safari. All changes were implemented using React and TypeScript, emphasizing type safety, maintainability, and clear data visualization interactions within the front end codebase.