>https://www.washingtonpost.com/world/national-security/in-clinton-email-investigation-justice-department-grants-immunity-to-former-state-department-staffer/2016/03/02/e421e39e-e0a0-11e5-9c36-e1902f6b6571_story.html?tid=sm_tw

The word "staffer" continues to amaze me. What does such a person do, what's the job description?

I mean, a crater makes crates, a ringer makes rings, but what does staffer do?