Tom Cooper enhanced the authentication flow for the open-webui/open-webui repository by implementing OAuth PKCE login without requiring a client secret. He updated the backend configuration to support the PKCE protocol, ensuring the login button is always displayed and the user experience remains consistent. Using Python and leveraging his skills in API integration and OAuth, Tom focused on aligning the authentication process with modern security standards. His work reduced sensitive data exposure by removing the client secret from the flow and stabilized the login experience. The project demonstrated depth in backend development and careful attention to both security and usability requirements.