I work at FB. I wouldn’t want to be working alongside people who think I’m a mercenary abdicating my moral precepts. And I wouldn’t expect that of my colleagues. So my guess is that you could get away with it easily, but you‘d be doing a disservice to yourself and your team.
No, I certainly wouldn't think of my coworkers as mercenaries for hire, as that's a very simplistic worldview that I don't subscribe to. My net concern is: Will me working at FB be a net good, neutral, or bad for society? I'm fine with neutral, I just don't want it to be a net bad.