Will Davies enhanced the authentication experience for the better-auth/better-auth repository by implementing an OAuth login user experience improvement using TypeScript. He integrated the loginHint parameter into the Microsoft OAuth flow, enabling the pre-filling of user email addresses during sign-in. This technical approach involved secure URL construction and careful handling of authentication parameters to ensure the loginHint was reliably propagated. By focusing on end-to-end OAuth integration and thorough flow testing, Will reduced user friction and improved onboarding efficiency. The work demonstrated practical skills in authentication, OAuth, and TypeScript, addressing a specific usability issue with a targeted, well-scoped feature enhancement.