I worked with field engineers when I was inspecting for the state (Florida).
They were usually contractors, not state employees, who were hired to OK site driven changes to mastered plans. It looked like a pretty interesting job. They seemed to be operating is a fairly "wild west" mode. If the engineer stamped something and it looked safe to me, off we went. The jobs were as mundane as a tool booth (MM99 on I75) or as exotic as renovating a 1926 mansion/museum (CaDZan in Sarasota).
