In movies like Alien, who builds the alien ships? They obviously don't have the skill to hold a screwdriver or wrench or ability to build a ship. I can't see the aliens sitting in an office complaining about meeting deadlines in the breakroom.

 “Tell me you’ve never seen Alien without telling me you’ve never seen Alien.”

This-

was not built by this:

But instead by this-

Who, under that suit (to my vast disappointment, dammit Prometheus!) looks like this-

All other ships in the series are built and operated by humans.

Well.

Apart from the ships used by the Predators in the Alien Versus Predator bits.

September 29, 2023 EDIT- The fact that this nearly content-free response to a question that was almost certainly a joke is my most-upvoted answer on this site of this writing would be sad if it wasn’t so damn funny.