SAIC is seeking a Model-Based Systems Engineering (MBSE) Engineer to support SAIC's Prime Program, Landmark AOS in Chantilly, VA. Landmark AOS is a large SETA program, supporting the NRO's Ground Enterprise Directorate (GED), responsible for the acquisition of systems over the complete end-to-end life cycle. Must have an Active Top Secret/SCI with Poly. As the Model-Based Systems Engineering (MBSE) Engineer, you will provide essential SETA support to the Landmark AOS MBSE Team, focusing on ensuring that the HIVE ground external and internal interfaces are accurately defined, verified, and maintained in MBSE-compatible formats.