There are no shifts for engineers when it comes to testing events. From my experience they are usually all there. Yes, during the production process you've got

There are no shifts for engineers when it comes to testing events. From my experience they are usually all there. Yes, during the production process you've got shifts of workers/technicians/engineers. Testing: it's all engineers plus enough of technicians they like the most (by negotiating to shuffle around the shifts where possible). It's probably the same at SpaceX.