Science specialist
A science specialist was a specialist whose field of study was primarily focused on science.

In 2256, Captain  invited Michael Burnham to join the bridge crew of  as a science specialist after Burnham had been previously stripped of rank following her court martial. ()

In 2268, Spock objected to James T. Kirk piloting the shuttlecraft into the space amoeba because, among other things, he was not a science specialist. ()
Scientific occupations