Someone who knows how to launder money for other people like drug traffickers, hackers, terrorists, and corrupt politicians. Do they get hired to launder other people’s money or not?

Yes. There are many such players in the banking and payments world that do this for a living. Needless to say, they don’t openly advertise themselves.

A lot of them are masked behind foreign off-shore shell companies where finding the identity of the true people behind them is almost impossible.

Professional money launderers take a hefty fee (depending on the market) for whitening their money.

One such example of such a professional launderer is Altaf Khanani. You can briefly see this story (a little over exaggerated and dramatized, but the gist of it remains the same).

There is also the FATF report on the same.

You can read this report in full from here.