Jett Chen modernized authentication for the ScottyLabs/cmumaps repository by migrating from a custom login and logout system to Clerk, a third-party authentication provider. He replaced the existing authentication UI with Clerk’s SignInButton and SignOutButton components and refactored the user hook to consume Clerk’s user data and authentication status. This transition, implemented using React and TypeScript, centralized authentication logic and reduced the maintenance burden of custom code. By leveraging Clerk’s standardized flows, Jett improved security and reliability while laying the foundation for future enhancements such as multi-factor authentication. The work focused on frontend development and did not involve bug fixes.