Worked on enhancing the reliability of RetroArch’s replay system by addressing a critical data integrity issue. Focused on C programming with an emphasis on file I/O and stream handling, the developer fixed a bug where improper stream positioning after reading could lead to data truncation in replay files. The solution involved ensuring the stream was correctly rewound and positioned before writing, particularly during in-progress recordings that required seeking. This change, applied directly to the libretro/RetroArch repository, aligned with C99 standards for update-mode streams and resulted in more robust replay saves, reducing the risk of user data loss during gameplay sessions.