Below is a guide to submitting an application, and information to help ensure that you meet all requirements for employment with ICE. US work visas requires the prospective employer to first file a petition with U.S. Citizenship and Immigration Services (USCIS).1. UTSA offer letter. 2. Completed H-1B Applicant Worksheet. 3. Receive a "Job Offer Letter" - Once you are offered a job, you must receive a Job Offer letter from the hiring supervisor. Employment-based green cards are granted to those who have a job offer from an American employer and possess skills that are in demand. Receive a "Job Offer Letter" - Once you are offered a job, you must receive a Job Offer letter from the hiring supervisor. Make sure of the following. A) That the position mentioned in the LC was 'Product Engineer'. This can cause confusion and frustration for the employee and may even result in the job offer being declined.