Worked on the aevatarAI/aevatar-station repository to enhance the user authentication system by introducing an is_new_user flag as a claim on the user principal. This feature, implemented in C# with a focus on backend development and OAuth, allows authentication flows via Apple, Google, and Signature grants to explicitly distinguish new users from existing ones. The technical approach involved modifying the authentication pipeline to inject the new flag, enabling downstream systems to tailor onboarding experiences and improve analytics accuracy. This foundational change supports more granular user segmentation and paves the way for adaptive user journeys across multiple authentication providers.