Loan officer assistants are responsible for assisting with the loan application process by reviewing and preparing client documents within a given period of time. As a loan officer assistant, you work in support of a certified loan or mortgage officer. Your everyday duties include ensuring paperwork is filled out completely, following up on credit checks, following up with customers for missing information, and preparing cost estimates for borrowers. You may also have sales and marketing duties that include calling potential applicants and following up with existing clients to explore future loan opportunities. Loan officer assistants work at banks or other lending institutions, so most of your day is spent in an office.