Worked on the uc-cdis/sheepdog repository to address a critical correctness issue in the deletion workflow, focusing on backend reliability and data integrity. Using Python and JavaScript, the developer fixed a bug where an incorrect entity identifier was used during transaction deletions, which previously risked accidental data loss. To ensure robust behavior, they implemented an integration test that verifies the delete-dry-run commit semantics, validating that deletions are handled safely before being committed. This approach strengthened the repository’s backend by reducing the risk of incorrect deletions and improving confidence in deployment, demonstrating careful attention to integration testing and API development best practices.