SEI Group, Inc. is a global small business firm that provides engineering and construction services to federal government agencies and specializes in building systems and energy savings. Our customers are at the forefront of every project we undertake, which has allowed us to receive notable recognition as quality performers; since 2002, SEI has been a member of the Hispanic Business 500, since 2004, a member of Inc. 500, and in 2007 was awarded the Boeing Performance Excellence Award. Sustainability. Energy. Infrastructure.