Hi there
I saw the sample you sent.
In this app, the protocol that will be used for communication and managing slow internet connections are very important.
I have experience in building apps with real-time connection and There will be no problem for me to do build this app.
Also, I have a team and I can add them to speed up if you want.
Please contact me over chat to discuss more your app.
Also, I will support the app for 6 months and I can sign an agreement for this so you won't worry about future bugs if you choose me to build the app.
Hope to hear from you soon.
Thanks