Any Tips on Hiring iOS App Developers in USA for a Startup?

Hey all, We’re a small startup building our first mobile app and need to hire iOS app developers in USA who understand scalable architecture and can work closely with our internal team. Our MVP has to be fast, secure, and visually clean. If you’ve worked with U.S.-based iOS developers before—freelancers or agencies—please share your experience. What made them stand out? Also, where did you find them (Upwork, Clutch, LinkedIn, etc.)? Thanks in advance for any advice!