factotum

A factotum is a person employed to do all kinds of work—an assistant or servant with wide-ranging duties rather than a specialized role.

The word suggests someone who handles whatever needs doing, from administrative tasks to manual labor.

The office factotum kept the copier running, organized the files, and somehow remembered everyone's coffee order.

Though the term can imply a valued jack-of-all-trades, it sometimes carries a slightly dismissive tone, suggesting someone at the beck and call of others.