Worked on the graphql-hive/gateway repository to enhance error handling in subschema delegation, focusing on correcting error path reporting when delegating a single item to a list. Addressed a bug that previously caused confusion in complex federated schemas by ensuring accurate error-path alignment, thereby improving debuggability and reliability for users. The solution involved updating the delegation logic and introducing regression tests to prevent recurrence of the issue, which also increased test coverage and traceability. Utilized GraphQL, JavaScript, and TypeScript, applying schema stitching and testing skills to deliver a more robust gateway workflow and support confident schema federation in production environments.