Tests and optimizes the functionality of systems, networks, and data; identifies and defines business or technical requirements applied to the design, development, implementation, management and support of systems and networks; designs, develops and maintains data management systems and/or databases; ensures optimal use of commercially available products. Customer Service - Works with clients and customers (that is, any individuals who use or receive the services or products that your work unit produces, including the general public, individuals who work in the agency, other agencies, or organizations outside the Government) to assess their needs, provide information or assistance, resolve their problems, or satisfy their expectations; knows about available products and services; is committed to providing quality products and services.