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... (Budget: ₹200 - ₹500 INR, Jobs: Android, API Development, App Design, Backend Development, iOS, iPhone, Mobile App Development, PhoneGap, Video Editing)