Developed the foundational Central System scaffolding for the AliceO2Group/WebUi repository, focusing on centralized authentication and secure token lifecycle management. The work involved setting up the initial server architecture and implementing token management endpoints using Express.js and Node.js, with code written in both JavaScript and TypeScript. This backend development established a scalable structure for access control, supporting seamless integration with downstream services and reducing future integration complexity. By aligning the implementation with project requirements, the developer enabled robust authentication flows and accelerated the path for additional features, laying the groundwork for secure, maintainable, and extensible backend infrastructure.