There's also a lot of so-called behind-the-scenes work.
Literal
So-called backstage-work [also-も] lots exist.
いわゆる (so-called) flags the term 裏方仕事 as a recognizable concept rather than a formal term. 裏方 (behind the scenes/backstage) contrasts with the public-facing work. も (also) implies this is in addition to more visible tasks. Simple but practical.