Description. Leidos is a FORTUNE 500 company bringing a mix of innovative technology and sector expertise to customers in the national security, engineering, and the health industries. Leidos is seeking a Senior Cloud Security Architect for a position as part of a team supporting internal and external Leidos customers. Leidos is seeking a mission-driven, goal-oriented Senior Cloud Security Architect to support a large, mission-critical 24/7/365 h...