I've start working with mobiles in 2009 with symbians Then I kept working with android native java and c# xna on my masters degree Later in 2013 I was recruited to work on mobiles with MultiPlatforms tools where I made a study on about 30 tools

Then I've start working with javascript on AppCelerator Titanium, later on Xamarin Forms I've also got experience on working with Xamarin.Ios

Now I'm working with Swift

P.s. Ive also done much more than working with mobiles. Not describing that here...