What I read between the lines here is that the company hired someone with no experience and gave them more responsibility than they should have at the beginning of their careers.

I feel like this is somehow related to parasite.

None of the characters was incapable. All of them were good at what they were hired to - driver, housekeeper, tutor, art tutor. They were also hardworking at their jobs. The rich dude was also good in his job (and caring to his family) and worst you can say about rich mom is that she was naive.

I dont think you understood the movie.

I’m also extremely confused by the parent comment... why was him not knowing C++ relevant? He had a CS degree so he’s surely at least somewhat qualified.

Some people think you need to have experience in that exact language or framework to be hireable. I would not expect that especially among fresh graduates, but that is me.

They don't ask technical questions or anything related to CS...