This has been around for a few years and it's due for some major updates. The CSS questions are becoming very, very dated. > Have you played around with the new CSS Flexbox or Grid specs? Flexbox is well past the point where you should be "playing around" with it. It's time to straight-up learn it, if not start using it in production. It's ready. And if that leads you to the question of "well what about crappy old ve…
Is that really a bad of thing? If they're good programers and quick to pickup new technologies wouldn't you be better off getting them, training them, and when they succeed making sure you're compensating them enough to keep them onboard?
If what you wanted was someone completely versed in all your technologies and systems to just pickup and do the task, I'd say get a contractor who has the skills you need.