Chingiz Mardanov developed and delivered the Bridge API Fee Parameter Migration for the MetaMask/core repository, replacing the previous noFee parameter with a numeric fee parameter throughout the bridge API. He updated TypeScript types, validation logic, and request formatting to support the new parameter, ensuring that existing client integrations remained functional by implementing a backward-compatible migration path. Chingiz also revised and expanded the API’s test coverage to validate the new fee parameter and edge cases. His work demonstrated a focused application of API development, testing, and TypeScript, addressing a targeted migration with careful attention to compatibility and code quality.