We have a developer from Africa (Cameroon), and another one who just left (from Nigeria), both are/were great and came as students initially (student visa then

We have a developer from Africa (Cameroon), and another one who just left (from Nigeria), both are/were great and came as students initially (student visa then H1B). If someone can code I don't care where they came from. Your main barrier is the immigration status, more than country of origin.