This person reviews all the documents submitted by the processor and certifies that not only the information is complete, but it matches up with the requirements for the loan program you are applying for. (Conventional, FHA, VA, Rural Home Loans, Fannie Mae, Freddie Mac) They will then assess the amount of risk your loan poses for the lender. They are the last hurdle before the lender commits to lending you hundreds of thousands of dollars to buy your home.