iOS and Android App bug fixes and new features

I currently have an app on Android (native) and iOS (native - using Objective), working with an API (written in PHP - hosted on AWS using nginx). But there are few bugs I need to be fixed urgently and more features to be added. I need someone/a team that is expert on the above technologies, but also on: Real Time Communications, multi room video chats, push notifications, back end side, Amazon Web Services, TCP/Websockets, file transfers/upload/download. Development Qualities (must have): - Clear Communication and daily regular reports - You must be able to write clean code, no hardcoding and no shortcuts. - You must comment all code and modifications - You must be able to install the necessary requirements on the server. - Ability to work in dev, test and prod environments. - You must be able to do proper testing of the changes and regression test before providing user testing. Examples of bugs to fix needed: - some fields don't load lists for first time app downloads - some pictures not loading - unexpected behaviours on some button clicks throughout the story board - unexpected crashes - unexpected behaviour when screen goes on sleep mode - Some features don't work well on some devices ... Examples of features to implement: - push notifications for Android - modifications on iOS push notifications - modifications related to Stripe - changes of some buttons behaviors. - ability to upload, download and share documents - other improvements ...