Hello,
My name is Mauricio and in this case hire a Brazilian developer could be a plus for both sides :)
Going ahead I've read your attached file but I don't believe that offered budget is enough to do the whole project so I'm making my offer here, let me know what do you think about it.
I truly understood the whole project and I can really help you as a specialist, what I mean is make it without risks or unexpected outputs causing bad feelings for both sides after you put your expectations on it. As a plus our communication can be more effective once we are native Portuguese speakers if you're not we can communicate in english as well.
As an extra and to prove my interesting on this project I'll offer 1 hour of a free call before we start the development in order to review and make everything as clear as possible. You don't need to hire me or pay anything after that, If you do I'll also provide a guarantee of 30 days free of costs.
I wish we can work together and maybe create a long term partnership .
Regards,
Mauricio