I'm maybe in a similar situation as OP so let me clarify what I would ask -- might be the same as them.
Citizen and resident of an EU (Schengen) country, de facto working for a US company, though the employment contract is a standard employment contract with the local (EU) entity.
Interested in moving to the US to become a permanent resident and eventual citizen, and I expect that the current company would be interested in sponsoring. What's the best path?