RLB Mobile Project

I am looking for a user interface designer to assist in the design, prototyping and revising of a arduino system app. I have started a frame design and am playing around with figma to see what is possible. I guess it would be quicker to get a professional involved. The app I am designing will control a group of arduino units with commands generated from the app and also status information returned on the app. Before starting to build the hardware I would like to have a working prototype to understand what hardware requirements I will have.