> People must avoid using less mainstream languages in their coding interviews as it’s possible that your interviewer might not be familiar with those languages

> People must avoid using less mainstream languages in their coding interviews as it’s possible that your interviewer might not be familiar with those languages. As a former FAANG coding interviewer, I would disagree with this. Use your strongest language: being visibly fluent in any language gives a much better impression than trying to stumble through in a language you're rusty or unfamiliar with. The interview is (meant to, anyway) focusing on your thinking process, logic and data structures, not the details of syntax. I would avoid functional languages like Lisp or Haskell though, they're just too weird/different for most people and you risk coming off as an impractical idealist.