Worked on the better-auth/better-auth repository to enhance the Microsoft OAuth login experience by implementing a feature that pre-fills the user’s email address during sign-in. This was achieved by passing the loginHint parameter to the OAuth URL, ensuring that the user’s email is automatically populated, which streamlines the authentication process and reduces friction for first-time sign-ins. The work involved secure URL construction, careful handling of authentication flows, and thorough end-to-end testing. Leveraged TypeScript and OAuth integration skills to improve onboarding metrics and decrease sign-in errors, focusing on reliability and user experience within authentication workflows over the course of the month.