I need a live queue-management solution built once and deployed everywhere. On the web I want a snappy React interface; on phones and tablets the same experience should be replicated with Flutter for both iOS and Android. Core workflows are straightforward: customers join or leave a queue, hospital staff call the next person, and administrators monitor everything in real time. Secure user authentication keeps each role in its own space, while WebSocket-style updates (or any real-time service you prefer) push instant changes to every screen. Whenever a customer moves up the line, the system fires off a push or in-app notification. I also want payment management so we can charge for priority slots or other premium services; feel free to propose the most sensible gateway for that. Three distinct user groups must be accommodated—customers, hospital staff, and admins—each with a tailored dashboard. I will judge the work on speed, reliability, clean code structure, and clear documentation that lets my team deploy and maintain the app without guesswork. Deliverables • React web application, production-ready • Flutter mobile apps for iOS & Android, published or store-ready builds • Admin & staff dashboards with role-based access control • Real-time backend integration and payment gateway hookup • Deployment scripts plus setup and usage documentation If you have recent projects that prove you can ship real-time, cross-platform apps, I’d love to see them.