How to sponsor work visa? What is the definition of a work visa? If so, you will need a work visa to be legally employed in the United States of America. Unlike some countries, the United States government does not issue work visas for casual employment. In general, work visas are based on a specific offer of employment. Embassy or Consulate. Temporary worker visas are for persons who want to enter the United States for employment lasting a fixed period of time, and are not considered permanent or indefinite. Each of these visas requires the prospective employer to first file a petition with U. An approved petition is required to apply for a work visa. Citizenship and Immigration Services (USCIS). The period of time that you will be working should be noted in the employment contract or the visa application. S visa does not allow individuals to work in the U. S indefinitely or permanently. The Permanent Workers webpage describes the five employment-based immigrant vi...