Worked on the OHIF/Viewers repository to enhance the reliability of the authentication flow, specifically addressing issues encountered during sign-in and sign-out under enterprise environments using Keycloak, dcm4chee, and Traefik. Refactored the signout callback logic by leveraging React’s useEffect hook to ensure deterministic redirect behavior, and optimized user manager initialization with useMemo to minimize unnecessary re-renders and improve startup performance. This JavaScript and TypeScript work resolved navigation throttling and eliminated blank screens, directly improving user onboarding and deployment stability. The contribution focused on authentication, frontend development, and OpenID Connect, with changes tracked for traceability and maintainability.