Worked on enhancing playlist handling performance in the deckerst/media-kit repository by refactoring the playlist creation process. Addressed inefficiencies caused by repeated string concatenation in Dart, replacing them with a StringBuilder-based approach to streamline the generation of temporary playlist files. This optimization reduced computational overhead and established a more maintainable codebase for future improvements in media processing. Focused on performance optimization and refactoring as core skills, the work was tracked with clear commit documentation to ensure traceability and auditability. The changes laid the foundation for further efficiency gains in the playlist module, emphasizing robust engineering practices and code clarity.