Foreign nationals can work in the USA by obtaining either a non-immigrant visa or a green card. The difference between the two is that non-immigrant visas, such as H1B and L, only allow temporary employment, whereas a green card allows foreign nationals to work in the country throughout their lifetime.

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The H1B or Specialty Occupation Visa is aimed at skilled workers. It grants a minimum of three years of residency, which can be extended twice, up to a maximum of three more years. To qualify for the H1B visa, you need to be a graduate of a job-relevant course and have at least three years of relevant work experience. If the educational qualification is not relevant to the target job, at least twelve years of related work experience will suffice.

L1 or Intra-Company Transfer Visas are intended for foreign nationals who must work in the USA on the instructions of their employer. This type of visa is designed for those who are relocating to the US subsidiary or branch of their employer.

E Treaty Trader or Treaty Investor Visas are intended for the employees of accredited Treaty Traders or Treaty Investors. E visas are valid for only two years, but can be renewed indefinitely.

Employment-based green cards come in three types. EB1 is for managers and experts in the fields of science, arts, business, education and sports. EB2 is given to foreign nationals who have earned notable achievements in their respective fields. EB3 is for professionals who are sponsored by US employers to work in the country. This type of visa imposes a minimum level of work experience and educational qualification, as does the work visa.