Stronghold Engineering, Inc. is a construction company that specializes in design-build projects for the federal government and military. The company was founded in 1991 and is headquartered in Riverside, California. Stronghold Engineering has completed projects for the U.S. Army, Navy, Air Force, and Marine Corps, as well as the Department of Homeland Security and the Department of Veterans Affairs. The company has received numerous awards for its work, including the 2019 National Design-Build Project Award from the Design-Build Institute of America.