I've seen both variations in job titles. Which do you use?
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I use Systems Administrator because I look after a number of different systems whether you look at it from OS (Windows, Linux, Mac) or at an application level (more than I care to list).
Unless you're looking after one monolithic system, it's "Systems Administrator"
It should (IMO) be "Systems." Even if you are only looking after one giant "system" you have to take into consideration enough individual aspects that are on their own individual systems.
It should always be Systems Administrator. Even a single computer can be considered as several systems (like for example a server running multiple virtualized OS).
My college degree has Systems Administration in it as well.