As a mortgage assistant, your primary responsibilities are to review loan applications and prepare letters of credit for clients. You are an assistant loan officer, so work with your supervising loan officer and serve as administrative support. Your job duties include providing customer service over the phone and in person, fielding questions and complaints from customers, using computer programs to track loan processing and billing, and organizing documents. The qualifications to start your career as a mortgage assistant are a high school diploma or GED certificate and customer service experience. However, an associate degree in office administration or finance can help give you an edge in your job search.