Yes, it is rare to be outright prohibited. But it will definitely be looked down upon by managers. It is also culturally uncommon. Very few Google engineers are

Yes, it is rare to be outright prohibited. But it will definitely be looked down upon by managers. It is also culturally uncommon. Very few Google engineers are consulting on the side, for example. It is extremely common for CS professors to consult. And there are absolutely no conflict of interest restrictions. CS professors will consult in their direct area of research.