[crazygringo]

I've never heard the term "application developer" in a web context before -- in all the jobs I've looked at and companies I've worked with, the terms have been "front-end", "back-end", and "full stack" which is the combination of the two.

I agree that a full-stack developer should have familiarity with Linux, setting up servers, configuring MySQL in basic ways, and whatnot -- that's what the "backend" part is built on, of course. As you say, they need to be able to deploy an app. But their main job is coding, not administration.

So they only need familiarity with deploying, not expertise -- they should be able to get a few servers running for a startup with load balancing. They should not be expected to know the intricacies of MySQL tuning, network security, Linux security, network management, and so on. You're not going to expect a full-stack engineer to know how to use Wireshark. (Gravy if they do, of course.)

I'm just making the point that full stack does NOT include professional-level systems administration or database administration. A full-stack engineer is not a magical go-to guy who knows everything. It's just front-end plus back-end. It's firmly in the realm of coding, not administration.