Most companies don't hire international remote workers directly because of the costs associated with international tax reporting. If a worker is in another country, that means tax withholding / reporting in multiple places. So it's usually done as contract work through an international recruitment firm which handles all the payroll / tax stuff, or not at all. In any case, even if an American employer hired an American on contract, the full brunt of payroll tax would be on the contractor. Companies only pay half the payroll tax for employees classified by W-2s.
