Worked on enhancing the reliability of file I/O operations in the mariadb-columnstore-engine repository, focusing on improving error handling within the BufferedFile component. Applied C++ and C skills to deliver more descriptive error messages and implemented comprehensive unit tests to validate error handling across various failure scenarios. This approach provided clearer diagnostics, enabling faster debugging and reducing mean time to repair for I/O-related issues. By expanding test coverage and refining error reporting, contributed to higher code quality and maintainability for ongoing columnstore development. The work emphasized robust error handling and thorough testing, supporting more reliable storage workflows for engineering teams.