System(s) Analyst - Should System be Plural or Singular?

There are many positions and topics that revolve around "system(s) [x]" and a few other base words.

• Systems Analyst vs System Analyst
  • Does it change if we reference a function instead of a job title? e.g. Systems Analysis vs System Analysis, Systems Engineering vs System Engineering
• Solutions Architect vs Solution Architect, Solutions Engineer vs Solution Engineer

But then there are topics that are definitively singular, like Network Engineer or Application Analyst.

Of course, one could make the argument that if someone works with more than one system, they'd be a systems engineer, but to me, there is more nuance there.

Is there a "correct" variant or a way to determine which variant (singular or plural) is more appropriate for a given situation?

Solution 1:

Here is Ngram ... So I would not rule out "systems analyst".