None, I'd say :D
C# was pretty much my first one. Then did some Python in the meantime (mostly to get a bit into AI stuff and train a self-flying planey thing in a little game).
And I think then I somehow got into KSP, and tumbled across CKAN (although I basically no memory of that left, funnily), found a bug I think and did my first PR then.
CKAN was my first bigger project I contributed to.