A sales engineer (SE) is an individual responsible for selling an organization's product into a specific industry.
A sales engineer may work selling a company's products directly to customers, or may work with resellers and distributors.
A sales engineer is responsible for understanding a customer's needs, and for translating those needs into a solution that will satisfy the customer.
A sales engineer often works in a consultative sales mode.
This means the sales engineer works directly with customers, gaining an understanding of a customer's needs, and showing them how the prospective solution can fulfill those needs.