I went through your requirement and i think i am capable of doing this.
1- 4 Years of experience in Android development.
Please check below app on which i have worked.
REST API Based Apps :
1- Health KMore
Hello, dear, How are you.
Your project is very interesting for me.
I have rich experience in Mobile app for FFmpeg.
If you cooperate with me, you will ba able to achieve your purpose with the cheapest costs succMore