Mobile App to Engage 10,000+ Clients

I want to bring more than ten-thousand existing and future clients together inside a dedicated mobile app. The core requirement is a rock-solid user-profile system so every client can register, edit details, and view their personal dashboard without friction. The experience has to feel fast and reliable even at scale, so please factor in a backend stack (Firebase, AWS, or similar) that can comfortably handle a five-figure user base from day one. While push notifications or in-app messaging could be added later, the first milestone is a clean, intuitive app focused on profile creation, secure authentication, and smooth data sync across iOS and Android. Deliverables • Cross-platform mobile app (iOS & Android) with fully functional user profiles • Scalable backend with secure API endpoints • Source code, deployment documentation, and a brief hand-off session so my team can manage future feature additions If you have proven experience launching apps that grow into the tens of thousands of users, I’d love to see your work and discuss timelines.