What, in your mind, make for an effective "principal" level engineer — that is, say, one level above "senior". I put this in quotes because the titles are going to be flexible from place to place, but what in your mind does it mean to be that level above senior.

I think about this because we are hiring for a principal role at Forem, and we have our own criteria, but I think at the end of the day it is a matter of organizational expectations and personal expectations. So I'm wondering what you think.