For the work visa the most known one is the H1B and the above comment said the highlights about it but there’s others and in IMO the intracompany transferee is the “easiest” one ( nothing is easy about moving to the US ) about the job market for ur major u hv to do ur own research and maybe find on LinkedIn some Tunisians u share the same major with who hv made it to the US U can also check the American Tunisian young professionals association for some insights