I think it's very reasonable to have one person responsible for compute storage and virtualization infrastructure.
I can see how a big company would specialize though.
Mail me if you're the least bit interested in a growing team with little shiny-chasing and lots of pragmatic engineering.
I'm about a decade removed from any real "two-box shops" (small and/or startup focus etc.) and so sometimes think they can't possibly exist anymore. I see a few of the "we want the world" job postings and experience burnout just reading some of them.
"Pragmatic engineering" I like the sound of that but I'd secretly hope it's not meant to rhyme with "best practices" - I like good practices and all but I like and appreciate the actual games much more. :O) That's just a small parting snark - mostly harmless. Best of luck on your search! I'm trying to maintain some focus on data operations at the moment but with any luck my next jump attempt will be into something counter to current trends.