Software Engineering Institute (SEI) is a federally funded research and development center in Pittsburgh, Pennsylvania, United States. Founded in 1984, the institute is now sponsored by the United States Department of Defense and the Office of the Under Secretary of Defense for Research and Engineering, and administrated by Carnegie Mellon University. The activities of the institute cover cybersecurity, software assurance, software engineering and acquisition, and component capabilities critical to the United States Department of Defense.

Pittsburgh is a city in the Commonwealth of Pennsylvania and the county seat of Allegheny County. It is the second-most populous city in Pennsylvania after Philadelphia and the 68th-most populous city in the U.S., with a population of 302,971 as of the 2020 census. The city anchors the Pittsburgh metropolitan area of Western Pennsylvania. Its population of 2.457 million is the largest in both the Ohio Valley and Appalachia, the second-largest in Pennsylvania, the 7th-largest in the Mid-Atlantic region and the 26th-largest in the U.S. Pittsburgh is the principal city of the greater Pittsburgh–Weirton–Steubenville combined statistical area which includes parts of Ohio and West Virginia.