I interviewed a guy with quite a few years of experience, university studies from a first world country, very long CV with stuff that he did, most of it relevant to the job, and 5-6 certifications, 2 of which relevant to the job, which would qualify him as an expert (as he himself declared in the CV), of a higher qualification than mine, but less experience.

Welp, if we're gonna hire someone with a higher salary, from whom I am to learn, I better come up with an interesting, but simple to understand problem, relevant to the position, that I would solve in 30 minutes, and give him 2h (surprise factor, unpreparedness, nervousness should be considered).

40 minutes in and I understand that there is lots of doing, lots of code, but the guy has no idea what he's doing.
I simplify the problem, remove the complicated bit. Turning it into a "business case description" of an entry level problem.
...
Same shit. In 20 minutes, zero progress. At this point the solution should be exactly 4 short lines of code. He gives me 50 that produce a completely wrong result, and he has no idea why.

I simplify further. I explicitly express the problem as the entry-level problem that it is - to count the number of interactions on the website in a specific day. That's it.
10 minutes more pass. I don't know why I'm wasting my time. Maybe I just want to be polite. Maybe I want to eliminate all doubt that it's not something else.
Nope.
He couldn't even react to my explanation of why he got the wrong result, and that all he had to do is move some stuff around.

Certifications, experts, universities.

What the fuck people? Can't we be simpler, and instead be knowledgeable? The time it took him to write that list of certifications, he could've learned how to solve this problem from any introductory course.