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. Yes, I originally put my offer letter in the package to NVC and estimated my expected income.Will you now or in the future require sponsorship for employment visa status (e.g. US work visas requires the prospective employer to first file a petition with U.S. Citizenship and Immigration Services (USCIS). The visa options generally depend on the specific nature of the position and your employment terms. For seasonal roles, the H-2B visa is indeed a common choice. As part of the interview I need to share a job offer letter. My employer wants to write it but needs to know what all should go inside the letter.