The IT engineer specializing in information systems and networks is a key player in the business. He is trained to intervene at all levels of the business network and information system. He brings his skills in the fields of data center and database administration, network administration, definition of information systems architecture, development of applications intended to improve the efficiency of business, project management and development team on information systems. Its relations with other parts of the company are essential. The engineer must, in a pragmatic way, be able to formalize the needs with the users and to set up a project methodology with his collaborators