Gateway Demo/Civil Corp. | 885 followers on LinkedIn. Certified MBE/DBE- NYC, Long Island and lower New Your State. Heavy Civil, Drilled Shafts, SOE, Minipiles, Tiebacks | Gateway Demo/Civil Corp. is one of the leading certified MBE/DBE/SBE Heavy Civil and Demo contractors in the industry today. Additionally, the company is a VENDEX approved contractor that is fully insured and bonded. Furthermore, Gateway is a certified union contractor.