What does mactec do? MACTEC was among the largest engineering design companies in the United States. The company provided engineering, environmental, and construction services to private- and public-sector clients. MACTEC was based in Denver, Colorado until 2002, when they merged with LAW Engineering and the headquarters were moved to Alpharetta, Georgia.Where is mitmactec located? MACTEC was based in Denver, Colorado until 2002, when they merged with LAW Engineering and the headquarters were moved to Alpharetta, Georgia. At that time they employed 3100 staff in 80 locations, with capability in more than 50 scientific and engineering disciplines.What are maxtecs hours of operation? Maxtec is available from 7:00am – 5:00pm MST. Feel free to contact us during these hours for customer support or to place an order. Are you planning to visit Maxtec? You can take advantage of our discounted rates at the Hyatt Place in Farmington Station.When did amec buy mactec? In May 2011, AMEC announced that it had entered a deal to buy MACTEC for $280 million. ^ a b c d "MACTEC, Inc". Company profiles. Hoovers.