Trumps federal hiring freeze draws immediate fire from union

[MBS]

4. not to mention people who will be utterly unqualified for highly specialized positions

such as scientific officers for USDA, NSF, the Office of Science and Technology Policy (though probably they have in mind to eliminate that office entirely)
and knowledgeable naturalists and researchers at NASA, NOAA, the National Park Service and other federal lands.

Also, competent and non-partisan economic analysts at Labor, Treasury, and many other depts.
Statisticians in almost every area of government.
Also, trained, experienced diplomats at the State Dept. (And you know that many career diplomats are going to be resigning. . )

And that's just what comes to mind off the top of my head.