I have an app concept which is quite simple in function. I have already mocked up low-fidelity wireframes so you would need to just make it look BEAUTIFUL and modern. Your design should reflect current apps because the aim is to show it to a large national audience.
The design should be ready to hand off to developers once I am satisfied with the requirements, so must be done in sketch or Adobe XD or equivalent.
Please reply with portfolio and best timeframe estimate. Note: my budget is closer to $500 USD.