I have done much of which I repent - since I became a Christian I have discerned and recognized this; and three of the worst of my sins were being a doctor, a scientist and a university teacher.
What appalling professions these have turned out to be: how solidly and aggressively evil these three careers have become!
Are there any worse jobs? probably not. Some are equally bad: politics, the civil service, law, the mass media, police... but none are significantly worse than medicine, biological research, and academia; none have contributed more to the current corrupt, cowardly and value-inverted state of the world here-and-now.
Yet these activities are what I gave the bulk of my life to!
Nothing to be proud of there... Much to repent.