Looking for Mobile App Developer

Mobile App Developer tasks:
Common:
Up to date compatibility with React and React-Native library
Up to date compatibility with latest and pre-release versions of iOS and Android

Android:
Custom call screen (Java)
Cross-app share button similar to Messenger or any other social network app
File access for attachments
Camera access for photo and video attachments
Up to date compatibility with latest Samsung devices

iOS:
CallKit support (Swift)
Cross-app share button similar to Messenger or any other social network app
File access for attachments
Camera access for photo and video attachments

Of course if you have any question, please let me know anytime.