During November 2025, Charlie enhanced the shaka-project/shaka-player repository by implementing case-insensitive MIME type matching within the ManifestParser. This update normalized incoming MIME types to lowercase before parser selection, addressing playback failures caused by inconsistent MIME casing across platforms. Charlie used JavaScript and TypeScript to develop the feature, ensuring robust cross-platform reliability. To maintain code quality and prevent regressions, he wrote comprehensive unit tests that validated behavior across various MIME case scenarios. The work demonstrated a solid understanding of front end development and unit testing, resulting in smoother user experiences and simplifying future maintenance of MIME type parser mappings.