It's a civil matter, not criminal. Extradition is irrelevant.

The states agreed to honor court decisions in other states in Article 4 of the Constitution: "Full Faith and Credit shall be given in each State to the public Acts, Records, and judicial Proceedings of every other State." If a court in Washington says you owe money, it's enforced the same as if it were a court in California.

"Extradite" is not the right word - these are civil matters, the loser doesn't go to jail, he just has to pay something.

The question is more like: "could a sentence in Washington, resulting in a fine or other monetary obligation, be enacted or enforced in California?"

I don't know American law, but I'd be surprised if there were no mechanisms for Washington to tell California (and viceversa) "this dude owes us money, use your powers to make him pay please".

It's a civil tort, not a crime. Amazon would presumably have to serve process to the California resident ex-employee, who would need to show up to court in Washington or send representation to present their case.