My first guess was that they meant, like, rough around the edges. Maybe they do a lot of swearing and fights in the office! But that's kind of a weird thing to

My first guess was that they meant, like, rough around the edges. Maybe they do a lot of swearing and fights in the office! But that's kind of a weird thing to put in a job posting these days. Then I remembered that "grit" was a trendy pop-psychology concept a few years ago. I recalled it being used as a way to explain why some students do better in school than other students without resorting to ideas like "innate intelligence". The core of the idea was that you do better in school by working hard and not giving up. That kind of grit doesn't really work as the adjective "gritty", though. So my impression of the company is that they were looking for trendy way to say "we want to hire developers who are good at their jobs", stumbled over a dead trend, and didn't run it past a copy-editor. A poor first impression, but an understandable one.