We've all worked with them. A senior engineer I worked with previously, claiming 25 years experience, did not understand when I rejected his code that declared a pointer, set it to null and then proceeded to pass it to another function with a memcpy style interface to put data into a supplied buffer. It compiled and was therefore correct to his mind. After several incidents like this and lots of proclaiming "it doesn't work" when encountering a bug, which he would then proceed to make someone else's problem, I learned to think of him as a very poor tester.

I didn't perform that interview but I was left wondering what the hell he'd managed to do for so long. A long list of experience on a cv can be meaningless if every post has ended up being a net drain on the team while others work around the problem.