Legal Question in International Law in California

You can certianly file a court action against a California based company in California and if you have not been paid for services rendered you have grounds to file a lawsuit. Your biggest problem is that if you are only suing over a few thousand dollars, the lawyer fees would cost more than your claim. We have a court where people can represent themselves in small matters, and the cases are handled quickly and simply, but the people have to come into court in person. You could file the action by mail or overnight delivery services, but you would have to be here for the actual court hearing. You might be able to file something in your country, but even if Hungarian courts would have jurisdiction over a CA company, unless they have assets in Hungary, you would still have to enforce the judgment in California.