Yes, I originally put my offer letter in the package to NVC and estimated my expected income. US work visas requires the prospective employer to first file a petition with U.S. Citizenship and Immigration Services (USCIS).The ISSO requires submission of a job offer letter (or other proof of employment) for OPT Reporting Requests. A specific job offer from a specific employer is usually required for a work visa because it is the employer who is acting as your sponsor. Below is a guide to submitting an application, and information to help ensure that you meet all requirements for employment with ICE. A specific job offer from a specific employer is usually required for a work visa because it is the employer who is acting as your sponsor. All applicants for China Visa must complete a Chinese visa application form online. Upload employment documents in the ISSM Portal. International Student at DBU. Immigration process.