Developed and delivered a flexible sign-out callback routing feature for the langfuse/langfuse repository, enabling support for custom base paths in sign-out callback URLs to accommodate diverse routing flows and simplify client integrations. The implementation, written in TypeScript and leveraging React for front end development, included a targeted fix to ensure the custom base path is consistently applied during sign-out operations. This enhancement addressed integration friction by reducing the risk of misrouted sign-out callbacks, particularly in OAuth and SSO scenarios, and improved reliability for client onboarding. The work was completed collaboratively, focusing on maintainability and seamless integration with existing flows.