US work visas requires the prospective employer to first file a petition with U.S. Citizenship and Immigration Services (USCIS). When you go to apply for your SSN you will fill out an application form when you arrive.Following is the letter format I got from my attorney. Is this OK to carry. Click the link (Sample Department Letter for On-campus Employment) to download a sample department letter. Upload employment documents in the ISSM Portal. The Health Department Chest Centers provide low to no cost testing, treatment and care for tuberculosis (TB). We are pleased to offer you the position of (title) at an annual salary of (amount) at the Wharton School of the University of Pennsylvania. This guide describes how to apply for jobs using the Career Page web site. The process consists of the following steps: