Worked on the LifeSG/web-frontend-engine repository to deliver targeted frontend enhancements for the file upload flow, focusing on improving user experience and reliability. Implemented features in React and TypeScript that prevent form submission during file uploading or processing, introducing robust validation logic and multi-state status handling, including an INJECTED status. Expanded test coverage to reduce the risk of partial submissions and ensure alignment with API expectations, while updating Storybook documentation to clarify response formats for developers. Emphasized frontend validation patterns and thorough testing, resulting in a smoother, safer file upload process and clearer developer-facing documentation for ongoing maintenance.