It's been my whole career. Yeah, I've had to go in and do the grip'n'grin interview and talk to people for a couple hours to make sure I'm not a martian or something. But every job has always come about because someone at the company either knew I was competent (from working with me in the past) or asked someone I knew who told them I was.

I've never had a job that involved whiteboarding or any sort of coding test.