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I'm a postdoc working in topology and set theory. I've been interested in learning about categorical foundations just to see what the issues and techniques are there. But there aren't many people around me who work in this area, and there even seems to be some tension here with set theorists (at least on discussions in MathOverflow).
Category theory background: I took some algebra/algebraic geometry classes that started with category theory and always found the basic definitions very intuitive, but I haven't been exposed to it on a deep level.