high end mobile app required

I am looking for a high end mobile app for both iOS and Android. This app needs to have payment processing capabilities and require 24/7 support for maintenance and bug fixes. The successful freelancer must have in-depth experience with creating mobile apps and should be able to provide a flawless product that is secure and user friendly. This app must be designed with the latest industry standards. Proper testing and debugging must also be done before releasing the app. The successful freelancer should be reliable and have great communication skills. I am looking to build a long-term relationship with the right freelancer who can deliver a great product within the desired timeline.