LorisBatacchi
It's not how it works, even in Itay, where I assume you are going to be resident. You have the calculate the taxes that you would pay in Italy with the Wizzair salary, than deduct the taxes paid in switzerland. That's how the double taxation works.
That's if you decide to commute to Italy and have your family and center of interest there.
If you decide to live where you are based and deregister from italy (AIRE), then this does not apply and you are fine just with what wizzair is taxing you.