Worked on the THEOplayer/react-native-theoplayer repository, focusing on refactoring the background playback delegate to enhance internal state management for the React Native iOS integration. The approach involved converting DefaultBackgroundPlaybackDelegate from a struct to a class in Swift, allowing for more robust handling of internal state while maintaining the existing background audio configuration behavior. This change did not alter the external API, ensuring continuity for users, but improved the maintainability and extensibility of the codebase. Demonstrated proficiency in React Native and iOS development, with careful attention to code organization and native module patterns to support future enhancements in background playback functionality.