Worked on the archivesspace/archivesspace repository to address a data integrity issue in the MARCXML Authority Converter, focusing on backend development and data conversion using Ruby. The work involved correcting the logic that determines the century prefix in the 008 control field, ensuring that authority record creation dates before 1970 are no longer generated. This targeted fix required careful analysis of date handling and was reinforced by the addition of regression tests to verify correct behavior for pre-1970 dates. The approach emphasized robust testing practices and clear commit documentation, supporting future auditing and maintainability within the codebase.