There are a few ways to say "You're welcome". Which is the best for somebody in the workplace (inside and outside the team and of about the same level as myself)
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A phrase that hasn't been mentioned and may prove very useful would be
It's a polite way of saying "not at all".
I think どういたしまして is polite, but somehow carries too much the nuance of "You're welcome" in that it accepts the fact that whoever is thanking you is correct in thanking you. とんでもない rejects the very idea of needing to be thanked and in that way is more humble.