A good number of the technicians and engineers are contract employees. If one demonstrates ability, ambition, and commitment, a job offer from GM may be forthcoming, but I suspect there are few guarantees. Most testing is tedious and takes advantages of sensors and software. This "drudge" work, however, is absolutely necessary for the development of an efficient and reliable product. For many of the technical folks, it is looking at a computer screen and a long hallway with no windows, a tough job in terms of tedium. But at least this takes place in Michigan where the sun often does not shine for the winter months anyway!
A air suspended pallet that is used to move engines in and out of dynamometer bays
A tilt engine apparatus