Addis worked on the cashapp/misk repository, focusing on enhancing the clarity of database migration error reporting. They developed a feature in Kotlin that refactored the exception message format within the TraditionalSchemaMigrator, ensuring missing migrations are highlighted before applied migrations. This adjustment addressed confusion during schema migrations by making error messages more actionable for developers. Addis updated comprehensive tests in TraditionalSchemaMigratorTest to validate the new message ordering and maintain stability across migration paths. Their work demonstrated a solid understanding of database migration, error handling, and testing, delivering a targeted improvement with a clear technical approach over a focused one-month period.