I have never even heard of a company where a single person on the level of an engineer was able to spend 100k without getting approval.
Just ask for example sales persons on engineer level how easy it is to get 50€ for something they think will have a huge impact on closing a deal. They have the exact same problems.
According to our corporate portal, I have $100k of signing authority. Meanwhile, I can’t get approval for spend about $2k on flight and hotel to go to a conference that would be valuable for me. I’m going to end up paying out of pocket. I have co-workers who are afraid to order a new mouse when their current one is broken.
