Bees!

[Mordent]

or carpenter bees which are cuter

yes, engineering should get carpenter bees

I'd say blend "carpenter bees" with "sci-fi theme" and get "welder bees" - bees with welding masks that plate any wall girders that need plating, tile any lattice that need flooring, and repair any steel grilles. Naturally they turn the first thing they repair into their bee nest (not hive, carpenter/welder bees are solitary).

Bonus points if it comes with a new material (honeycomb) that they use to make the repairs which has a hex-ish texture and whatever bizarre properties you want to give it (let those with apidae metabolism eat it?).