Worked on backend reliability improvements for the librespot-org/librespot repository, focusing on Spotify integration using Rust. Developed and delivered infallible encoding methods for SpotifyId and FileId, ensuring that to_base62() and to_base16() no longer fail during normal operation. Enhanced the SpotifyUri::to_uri() method to be infallible, which reduced error-handling complexity and stabilized URI generation throughout the codebase. Updated unit tests and maintained documentation to reflect these changes, supporting maintainability and downstream client stability. The work demonstrated a methodical approach to backend development, emphasizing robust error handling and code reliability within the Rust ecosystem for music streaming utilities.