This is actually a pretty interesting question; hard disagree on Go though. I work in security but I don't do much formal code review, instead I care more about trying to figure out how things work as fast as possible. Go is easy to "parse" in that the language isn't too complicated but navigating the architecture of complex projects is annoying because there is just so much boilerplate everywhere that I have to cut through. It's kind of like how I feel with Java, despite it being one of my strongest languages. Otherwise I actually do know a fair number of languages well enough to comfortably navigate around projects that use them; I think C and JavaScript projects are generally not too bad, C++ can be pleasant or painful depending on how things are structured, and Python is also a toss-up. Rust, Swift, Scala, Kotlin are usually pretty good. Of the languages I really don't know I think I would rank Ruby as one of the worst, maybe TypeScript on the better side?