The big problem with using a software portfolio is that plenty of competent engineers don't have impressive work that they can share. If you don't (or can't, because of other obligations like parenting) code in your free time and aren't a recent graduate, you probably don't have much to show.
Of course, difficult whiteboard interviews that require studying to pass have the same problems probably and give less useful information. So, :shrug:.
I know. I'm fortunate to have one. Like I said, I completely realize that it isn't usual for people to have portfolios; especially ones with the scope of mine.
I just feel that it's rather self-destructive to ignore those rare instances where they exist.
Of course, difficult whiteboard interviews that require studying to pass have the same problems probably and give less useful information. So, :shrug:.