Zvone Busic focused on improving authentication reliability in the payloadcms/payload repository by addressing a bug in the User Authentication Auto-Refresh feature. Using React and TypeScript, Zvone resolved issues where token refresh failed due to a stale closure and missing configuration, ensuring that autoRefresh is now properly exposed in the client config. The solution involved updating the Auth provider to automatically refresh tokens without displaying the Stay logged in modal, leveraging useEffectEvent to always capture the latest autoRefresh value. This work enhanced the user experience and security by streamlining authentication flows, demonstrating careful attention to lifecycle management and front end stability.