When did mankind decide that certain jobs are decent and others not? This mindset must surely be that of the Satan, who thrives on dividing mankind by any means.
No! To God who said: "By the sweat of your brow you will eat your food” (Gen.3:19), every human being, no matter in which position they serve the human ecology, has a decent job. The engineer's job is as vital as that of the garbage collector. Don't look down on others, because God will look down on you. What is needed is for everybody to earn a decent WAGE and the respect of their fellow humans.