[farah7]

Curious as to why you love asking this question? I wonder what data you are trying to glean from this question. It's a very subjective question and wouldn't surprise me at all if the number of years experience a candidate has in that language is inversely proportional to the answer you're given.

I often get this question from recruiters hiring front end developers: From 1 to 10, how well do you know Javascript? I've given 8 for as long as I remember but often I think to myself if the people who wrote the V8 engine are 10 by default, there is no way in hell I'm even close to an 8.

[arithma]

A good self-rating strategy in an interview would be to try and percentile yourself among the people based on your knowledge and try to justify it with humility. C++ is huge, I expect I know more than 80% of the people due to (years of experience, different kinds of projects, yada yada), but I feel i have only been able to explore like 50% of the language so far (concretely learn that is) and there’s more to learn like (1, 2, 3..) and probably more that I might have missed completely.

[thechao]

It’s almost always 7. The actual question I ask is “rate yourself on a scale from one to Bjarne”. Bjarne Stroustrup was the principle in the group I did my PhD, and he rates himself a 7, so when interviewees give ‘7’ as the answer, it makes me laugh.

[tcbawo]

Maybe they perceive it as a calibration question: "do you know how much you don't know" and "how much are you going to overpromise if you start here"

[thechao]

The way I ask the question is done to relax the candidate and make them start to think about the only person who matters in the room: themselves. I’m looking for intellectually curious people; a bit of modesty & self-reflection tend to go along with that.

Technical skill is a bit irrelevant, as essentially no one does the sort of low level SW our team does, anymore.