Out of this world (sorry couldn't help myself )
It's actually very structure very tedious work. The number of times you have to do the same work is very high. We were response for the "Canadarm" which is on both the shuttle and the space station. I had to redesign the same communication transceiver 5 ways for example, just to get the "most prefered" way.
Testing on the "Vomit Comet" (reduced gravity aircraft) and the Natural Buoyancy lab was the best part. Not recommended for those who are prone to motion sickness,
until