President Donald Trump-led US offers five employment-based immigrant visa categories for eligible foreign workers seeking permanent residency. What Each Employment Visa Category Covers1. E3 Skilled, Professional and Other WorkersThis category covers Skilled workers, professionals and other workers. Skilled workers must demonstrate at least two years of relevant training or work experience, while professionals are required to hold at minimum a bachelor's degree or its foreign equivalent. Visa: Employment Second PreferenceThis one is reserved for certain special immigrants.