I just made it up, but I guess it would be a designer that can do the whole song and dance. In the article he specifically mentioned that UX and Visual Design is not the same thing; fair enough but startups want to do more with less...
Again, I'm no expert and I'm just a technical nerd who "doesn't get" designers. Probably should keep my mouth shut, in retrospect ;)
Nice! Knew what a fullstack programner was so I was thinking it might be along those lines.
As was mentioned before, more often than not, startups have limited funding and can't afford both a UX guy and designer. Full stack for the budget! FTB?
I'd prefer "relevant stack designer." Full stack implies backend and database, about which the designer really need only have a basic understanding of constraints. Relevant stack would mean a mastery of front-end technologies.
I suppose it can be definite as "someone who does what is asked for with nice(maybe not spectacular but at least nice) results, whether it's his main field or not, as long as it's related to it."