Imposter syndrome is hard to evaluate because it's comparing three levels of skill: 1. Your skill 2. The skill required to do your job well 3. (Implicitly) T

Imposter syndrome is hard to evaluate because it's comparing three levels of skill: 1. Your skill 2. The skill required to do your job well 3. (Implicitly) The skill of your peers The third one is what gets a lot of people who don't directly work with peers. In that case, one can only go by what one hears. And people who blog are self-selected and biased toward having high skills. The non-self-promoting experts are famous for doing great work, so they're even more likely to have high skills. But I think #2 needs to taken into account. You may not be an expert in your field. But if everyone you work with comes to you for help with a task, and you're able to help them, then you're the in-house expert. Unless you want to be a expert among experts, that's not bad.