Great question! It looks like we have a few open positions in the UK & Australia for citizens of those countries, but as far as I can tell, all of the jobs here in the US require citizenship. Could totally be wrong about this, however! I'd recommend pinging a recruiter or HR and ask them directly about the citizenship requirement.
I see that most of the jobs require a US citizenship. Is there a any position available for a foreigner? If yes, can I filter such jobs in the portal?