Worked on the Kazumi repository to enhance cross-platform volume management for a Flutter-based mobile and desktop application. Implemented persistent volume settings across sessions, using Dart and Flutter to ensure platform-aware initialization and asynchronous fetching of user preferences at startup. Refactored the player controller to remove redundant state and establish sensible defaults, such as setting desktop volume to 100 percent. Addressed a user experience issue by pausing playback before hiding the player on non-macOS platforms, reducing glitches in the UI flow. These targeted improvements increased reliability, streamlined startup behavior, and improved maintainability of the codebase for both mobile and desktop environments.