building small app input text

hello i want to create an app where people in my comunity can sell their coins ( sweatcoin ) and i pay them back
they just need to fill some informations and i get their request via jsmail provider.
www.sweatcoindz.com
this is my old site and it would look like it

project pages are listed here
in images
i would want to work with low price as its so simple.
looking for an indduvidual worker

the app online android no ios requirments

thank you