Okay, let’s tackle this. So Johnson has skills in multiple areas like iOS, Android, C++, C#, Html 5, and Agile methodologies. He has a degree from Dr. D. Y. Patil College - Pune University, which adds some weight. Location is Redmond, Washington, which is near Seattle, a hub for tech companies. However, considering his skills, this is a general estimate. Average rates for mobile developers in the US can range from $100 to $250 per hour, depending on the skills and experience. Given Johnson’s skills and location, I estimate his hourly rate to be around $125, which is at the lower end of the range.