KBR's National Security Solutions team provides high-end engineering and advanced technology solutions to our customers in the intelligence and national security communities. In this position, your work will have a profound impact on the country's most critical role - protecting our national security. KBR is seeking a Senior Model-Based System Engineering (MBSE) Systems Engineer to join the KBR team in support of a Science and Engineering Technical Support contract for the United States Space Force (USSF). This is a full-time position requiring availability for on-site access to Los Angeles Space Force Base in El Segundo CA, and as-needed remote work flexibility. The Space Systems Command (SSC) Space Systems Integration Office (SSIO) Science & Engineering Technical Support team is looking for an energetic and innovative Senior Model Based System Engineer (MBSE) Systems Engineer to focus on developing government reference and portfolio level architectures aligned with future US Space Force (USSF) force design and enabling enterprise level interoperability and flexibility. The candidate shall provide systems engineering, MBSE, and road mapping support to shape the future of the United States Space Force (USSF) Space Systems Integration Office enterprise architecture. The candidate shall work side by side with SSC personnel in the performance of engineering tasks applying critical thinking concerning solutions to current threat environments for National Security Space (NSS) customers. Experience with Digital Engineering, specifically MBSE, is required to support USSF objective of being the first 'digital force.' Experience in cross-domain architectures is desired to meet the goal of SSC/ZA's cross-enterprise architecting and analysis efforts, providing high quality decision support products to the SSC and USSF senior decision makers for the space acquisition enterprise.