Worked on the base/web repository to deliver a targeted bug fix that improved the reliability of the getUsernames API endpoint. Focused on strengthening address parameter validation, the work involved enforcing strict input checks and sanitizing user-provided data to prevent malformed requests from reaching downstream systems. Enhanced error handling and user feedback mechanisms were implemented, allowing clients to identify and correct invalid addresses more efficiently. The solution was delivered as a focused, low-risk patch with clear commit history for traceability. Utilized TypeScript and applied skills in API development and error handling to ensure robust and maintainable backend functionality.