Okay, let’s tackle this. So Jeff Holliday has a mix of skills that are in demand, like iOS development, user interface design, and experience with multiple programming languages. He’s located in Seattle, which is a hub for tech companies. Average rates for iOS developers in the US can range from $100 to $250 per hour, depending on experience and location. Given Jeff’s skills and experience, I’d estimate his rate to be around $125 per hour, which is on the lower end of the range but still reflects his value as a skilled developer.