That's a hell of a lot more difficult than most US employers are used to. A lot of companies here offer what is called "at will" employment, which basically rounds down to "we can fire you whenever, you can leave whenever."
See how that wouldn't necessarily align well with the Brazilian way of doing things?
Not always, look up "implied covenant of good faith and fair dealing" which can be a broad exemption to "at will" employment in several States including Utah.
See how that wouldn't necessarily align well with the Brazilian way of doing things?