Worked on stabilizing the masquerade flow within the bigcommerce/b2b-buyer-portal, focusing on improving the user experience during session transitions. Addressed a critical issue where ending masquerade previously resulted in blank pages by refining the hashchange event handler to read window.location.hash at the precise event time. This solution ensured that users were reliably routed to the /dashboard, maintaining the app frame and reducing support incidents. The work involved hands-on integration testing to validate the fix and leveraged TypeScript and React for robust event handling and single-page application routing, demonstrating a methodical approach to front end problem-solving and session management.