How do i contact mastec? Contact Mastec, Inc. – Phone: 305.599.1800 - 800 S. Douglas Road, 10th Floor, Coral Gables, FL 33134How many employees does mastec have? With offices across North America, a workforce of nearly 22,000 skilled professionals and an extensive wholly-owned fleet of specialized ... Mission: Our mission at MasTec is to be recognized as a company that achieves customer expectations safely, profitably and in a manner that is rewarding for both our customers and our team.Who is mastec advanced technologies? MasTec Advanced Technologies is the leader in last mile fulfillment services for the deployment and installation of technology and IoT devices. Water & Sewer. MasTec provides turnkey solutions for water & sewer, and distribution transmission systems, including treatment plants and facilities.