Always and never, in two different respects. I was a researcher and entered SW sideways. So I never suffered from impostor syndrome, because I was always certain that I knew things that almost no-one else in the company knew (true for every company). On the other hand, I was never an authority on my current assignment. So I always felt like a Junior, trying to learn from those around me. That's still true, and I am in management now.
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