Worked on enhancing data integrity and consistency in authentication flows by addressing soft-delete support across the supabase/auth-js and supabase/supabase-js repositories. Focused on updating the User interface to include a deleted_at property, ensuring that soft deletion semantics were accurately reflected in both client libraries. This involved careful interface definition and alignment of data models to reduce drift between repositories, improving reliability in authentication state management. Utilized TypeScript for interface updates and API integration, emphasizing maintainable frontend development practices. The work improved testability and standardized user data shapes, supporting more robust handling of soft-deleted users across authentication modules.