A sales staffer is a person who works in the sales department of a company. The job title can be broken down into three parts: CLERK, REP, and EIV. A CLERK is a person who performs general office duties such as filing, typing, and answering phones. A REP is a representative of a company who is responsible for promoting and selling products or services. An EIV is an employee incentive program that rewards employees for their performance. All three roles are important for a successful sales team.