Under the terms of this offer, you would be foreign national holding an employer sponsored immigration status. US work visas requires the prospective employer to first file a petition with U.S. Citizenship and Immigration Services (USCIS).Complete Post-Arrival Check In e-form. 3. A job offer is required and the U.S. employer must file an Immigrant Petition for Alien Worker, Form I-140, on behalf of the applicant. Below is a guide to submitting an application, and information to help ensure that you meet all requirements for employment with ICE. Make sure of the following. A) That the position mentioned in the LC was 'Product Engineer'. Learn the uses of an employment verification letter (EVL), what it should contain, and how to request one. Plus, download free customizable templates. In the formal offer letter, provide comprehensive details about the position, compensation, benefits, and other pertinent terms.