главный звукорежиссёр(напр.: The painstaking work by Paul along with the project’s chief engineer Steve Orchard has enhanced the sound to make it more open, dynamic and expansive. Lily Snape)
старший механик(In marine transportation, the chief engineer is a licensed mariner in charge of the engineering department on a merchant vessel. "Chief engineer" is the official title of someone qualified to oversee the entire engine department; the qualification is colloquially called a "chief's ticket". wiki Alexander Demidov)
