3.5 years ago is the key. Xamarin has come a long way in the past 12 months, not to mention the past 42.
Developers who know this have grown considerably in that period as well.
On an aside, 90/hr for a competent dev is cheap. I know most people on HN don't make a salary that equates to that but freelancers have an entirely different set of concerns and 90 is low.