I say "Quartermaster" to explain one of the roles performed by the Operations Officer, so on Picard's Enterprise, that was Data. The rest of Operations Officer's job is to observe the air conditioning and rest of the ships bodily functions, then yelp if anything goes wiggy.
The bridge position is about error alerts, whereafter he tells people to fix stuff, which means that he organizes damage control teams and lets them know how many bandaids they're allowed to use and where those bandaides are, and makes sure they don't run out of bandaides.
He's a facilitator.
Deciding which half of the ship gets their hull microbreeches fixed and which half is sucking vacuum.