During the scale-up phase of LiSTNR, we focused on synthesising customer feedback and aligning insights with business objectives to evolve the mobile app. A key challenge was migrating a large user base while ensuring a seamless transition, which we addressed by prioritising feature parity and optimising onboarding to minimize friction for loyal users. The Cashrewards design system played a crucial role, providing a scalable framework that ensured visual and functional consistency across mobile and web platforms. This enabled us to rapidly roll out updates and new features, facilitating a smooth user transition while positioning the app for continued growth and engagement.