Anyone Have Experience Hiring iOS Developers in the USA?

Hey everyone, I need to hire iOS app developers USA for an iPhone app I’m developing, but I’m struggling to find the right professionals. I’ve seen agencies charging premium prices, while freelancers seem to vary a lot in quality. For those who’ve hired iOS developers in the USA, how did you go about it? Did you hire a local agency, work with a freelancer, or use a hiring platform? Also, what are some important things to ask before signing a contract? I’d really appreciate recommendations on trusted sources and any lessons learned from your hiring experience. Thanks in advance!