Well, my GitHub is public (and was probably convincing enough), and everyone but me at the company was asked to code during the interviews - there was evidence on the TV from someone who coded for an interview that morning even. I was found from a local AngularJS meetup, and someone at the company was trying to gently prod me towards interviewing with them over the course of months...which wasn't so much of an interview process as seeing whether I was interested, since they clearly wanted me for my expertise.