Sumtiogo focused on enhancing metadata management reliability in the apache/iceberg repository by addressing a critical issue with bulk deletion of metadata files. Using Java and backend development skills, Sumtiogo refactored the deletion logic to ensure that bulk operations would not fail when individual file deletions encountered errors. This approach improved the robustness and maintainability of the codebase. Comprehensive unit and integration tests were added to verify that no exceptions occurred during bulk deletions, reducing the risk of failures in large catalogs. The work demonstrated depth in backend engineering and contributed to greater operational stability for metadata management workflows.