Hi! sir.
I'm a mobile applications developer and I'm very interested in your job post involving these skills.
I have recently worked in iOS/Android/Flutter/React Native apps development and I also have User Interface design and Graphics design skills too.
I also have so much experience in Web/server development.
I have consistently delivered projects on time and under budget, which has earned my many positive ratings,
as you'll see in my work history, a number of my projects are in my freelancer.com portfolio:
https://www.freelancer.com/u/romansokol
Some of my works are very similar to your requirement.
We are available to chat via freelancer.com chat tool and your suggested chat tool,
and would be happy to set up a convenient time to discuss the application you're moving and some ideas about the safest way to get it into the cloud.