Software Engineering Institute | Carnegie Mellon University | 23,881 followers on LinkedIn. The Leader in Software Engineering, Cybersecurity, and AI Engineering | At the SEI, we research complex software engineering, cybersecurity, and AI engineering problems; create and test innovative technologies; and transition maturing solutions into practice. We have been working with the Department of Defense, government agencies, and private industry since 1984 to help meet mission goals and gain strategic advantage.