I am a french M.D and Ph.D developing on iOS and Android. Whaoh...StackOverflow is impressive. It helps me a lot.
I am amateur, but with a big background of development during the last 30 years : Basic on Apple 2, Turbo Pascal then C, then HyperTalk (ah...HyperCard!) on Macintosh SE30, Visual Basic 5.0 on Windows 95 to Seven, and now iOS and Android. I am also trained on PHP.