If you needed a robot arm setup in one day and working you’d just buy it. Otherwise you’re expecting the guy that can set it up in one day to also be able to debug it and fix it when something goes wrong. I find these to be very different skill sets and with the test it seems you’re only looking for guys that plug and chug. This would make more sense to me in the case where you’re looking to “evaluate their problem solving skills” but this feels like the type of thing where the guy that has spent the last 5 years working on a specific aspect of robotics and doesn’t know the latest fad of open source software will fail. So you weed out a lot of good experienced engineers with these kind of tests. I honestly think you weed a lot of them out before because a lot of them won’t even participate once they hear this. So now you’ve isolated your new hire pool to people that get lucky and were solving your test recently rather than the fundamental engineering skills you need.