E-Commerce Website & App UI/UX

I’m building a new e-commerce experience that must feel seamless whether a customer lands on the web storefront or opens our mobile app on iOS or Android. I already have the product requirements defined;... (Budget: $250 - $750 USD, Jobs: Adobe XD, Figma, Graphic Design, iPhone, UI / User Interface, User Interface / IA, UX / User Experience, Website Design)