Hello, How are you?
I have read your requirement carefully.
It is very interested for me.
I am a senior Android and iOS mobild app developer with 5+ year's experience.
Currently I am working with my team, we have excellent backend and web developer, too.
We are sure we can give perfect results(Backend, Admin, Android and iOS) to you on time.
Please share more detail with me.
After that, I can tell you about timeline and budget.
Please check my portfolio.
https://www.freelancer.com/u/peng72083
You can trust me, include ability, honesty, working speed,etc.
Hope to kindly reply,
Peng