End-to-End iOS & Android App

I need one cohesive partner who can take a blank concept and turn it into a fully functioning mobile product available on both iOS and Android. The work spans three clear stages: 1. UX/UI research & design... (Budget: $250 - $750 USD, Jobs: Android, Android App Development, iOS Development, iPhone, Mobile App Development, Python, UI / User Interface, UX / User Experience)