After the boss told his workers what to do, his officious [əˈfɪʃəs] assistant stepped in to micromanage.

officious
adj [əˈfɪʃəs]

Officious typically describes a person who tends to offer unwanted advice in a way that annoys the advice recipients. It is a synonym of meddlesome.

from the Latin noun officium, meaning “service” or “office.” In its early use, officious meant “eager to serve, help, or perform a duty,” but that meaning is now obsolete, and the word today typically describes a person who offers unwanted advice or help.

English