What you find interest in
is what others
find interesting about you.
As such, to know whether someone is interesting to you, ‘What are your interests?’ is perhaps a much more relevant question than ‘What is your line of work?’, unless the person’s line of work is aligned to your interests. It is also interesting to ask, ‘Is your work also your interest?’ If the person is already retired, chose not to work, or is unable to work, ‘What are your interests?’ is even more relevant.