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Event-Driven Architecture with Real-time UI Architecture with Project Ubin V was designed to enable atomic, instant Delivery vs Payment (DVP) of digital securities on STACS and payments on Ubin. The integration was built with the customer journey in mind with maximal automation in mind. The key design feature was to have the UI layer be updated asynchronously in real-time without relying on pre-set polling jobs. The architecture is as follows: Stateless UI built with ReactJS, Cross-Chain Application Backend, Polling Worker, No.SQL Database and Message Queue Service.