Mobile app for fitness startup

I am looking for a professional mobile app developer to build an app for my fitness startup. I need an app specifically designed for the Android operating system, but I am also considering adding support for push notifications as well. Additionally, I need the mobile app to also integrate online payments processing. The app must be user-friendly and able to smoothly handle large user traffic that it may experience over time. I need the app to be intuitive, easy-to-use, and aesthetically pleasing. As the app grows in popularity, I need it to be supported and able to handle rapid growth in users.

I strongly believe in performance and product excellence, so I’m looking for a dynamic mobile app developer who shares the same values. Please only apply if you can meet all of the requirements outlined above.