@cyberlyra maybe the equivalent in the US is "nerd"?

"A person who is single-minded or accomplished in scientific or technical pursuits but is felt to be socially inept."

To your point, it had been used as a pejorative for a long time because I think it was seen as someone who was passionate about something without any societal utility. But I think capital captured this phrase and it's now used as a marketable/fun way to mean "expert".