button pusher

Short definition from Wiktionary

Noun

1. 1
   Someone who pushes someone else's buttons: someone who goads, annoys, provokes, etc.
2. 2
   A low-skilled or unskilled worker: someone from whom one can expect little or nothing more than rote pushing of buttons (not showing, for example, critical thinking, insight, or leadership).
3. 3
   Alternative spelling of button pusher