[jokethrowaway]

This was true 20 years ago

Frontend (and mobile too) is pretty complex these days and a backend developer won't be able to do much there.

Similarly, full stack JS engineers doing node.js and react tend to have a good grasp of infra. When I interview I do a fang style system design interview and most candidates do well. The idea of "frontend engineers" doing a bit of css and jquery is largely gone.

Then, we can discuss whether the complexity is warranted, but that's another matter.

10 years ago banks were hiring contractors at top rate to fix their crappy java applications nobody wanted to touch, today they hire engineers to deal with their angular and react mess.