Worked on the graphql-hive/gateway repository to address a performance issue in GraphQL schema stitching by fixing redundant type merging in subschemas. The solution involved updating the resolveExternalValue function to skip unnecessary calls when subschemas lacked explicit names, which improved both runtime efficiency and correctness. This change targeted scenarios with large subschemas, reducing unnecessary computation and enhancing gateway reliability. Comprehensive tests were added using TypeScript and JavaScript to ensure that redundant merging no longer occurred when fetching from the source subschema. The work focused on GraphQL, testing, and TypeScript, laying the foundation for future type-merging optimizations in the gateway.