Modern Technology Solutions Inc. (MTSI) is seeking a highly experienced Systems Security Engineer to support the United States Space Force (USSF) organization that is responsible for developing software and the supporting architecture for the organize, understand, plan, decide, direct, and monitor capabilities within the C2 Joint Capability Areas (JCAs).   In this role, you will accomplish the integrated technical management and application methods, processes, and tools to deliver systems that satisfy stakeholder security needs for operation in contested environments. Job responsibilities will include, but may not be limited to: Provide technical knowledge and analysis of complex problems that need knowledge of current best practices and Government mandated policies for effective development and implementation of systems security solutions Comprehensive assessments of system cyber security architecture, security events/activities and posture Develop and implement system security plans, policies, and controls in accordance with DoD and NIST standards (e.g., RMF, NIST SP 800-53) Conduct security risk and vulnerability assessments and develop mitigation strategies Provide system security expertise to obtain and maintain the Authorization to Operate (ATO) Risk Management Framework (RMF) accreditation requirements Develop and conduct processes for verification of Interim Authority To Test (IATT) and Interim Authority to Connect (IATC) documentation and procedures for prototypes and external systems connecting to the Space C2 Enterprise Support efforts to accredit software systems for IL4 and up to and including TS/SCI/SAP environments within OEM or government developed cloud environments as directed by the government Coordinate with cross-functional teams to ensure systems security is integrated early in the systems engineering process Contribute to Program Protection Plans (PPPs), Security Classification Guides (SCGs), and related security documentation Provide technical expertise in areas that have system security and/or cybersecurity touch points such as defensive cyberspace operations, joint operations planning, policy, and technical intelligence  Initiate actions for providing support to various working groups such as system security working groups, cybersecurity working groups, change management boards, etc. Qualifications Required Experience: 20+ years of professional experience supporting the DoD and/or IC communities 5+ years of experience in cybersecurity or systems security engineering within a DoD environment Experience supporting system accreditation packages and security documentation Familiarity with RMF, NIST SP 800 series, and DoDI 8510.01 Demonstrated experience with applicable IC and DoD policies, procedures, and operating instructions related to program security, information assurance, Experience working closely with ISSMs/ISSEs and government security stakeholders At least 2 years of TS/SCI experience Desired Experience: Relevant experience and knowledge of Defensive Cyber Operations (DCO) Experience within the National Security Space and/or the Ground Systems Mission Areas Experience with SDA SW Experience with Infrastructure, Platforms, Networks and Data Education /Certification Requirements: B.S. in related field M.S. in related field Security Clearance Level Required: Active TS/SCI (Must be a U.S. Citizen) Location/Travel Requirements: Place of work is El Segundo, CA - Hybrid (on-site/telework) May require travel up to 25% of time within the continental United States The pay range for this position in California is $200,000/year to $240,000/year; however, base pay offered may vary depending on established government contract rates, job-related knowledge, skills, and experience, and other factors. MTSI also offers a full range of medical, financial, and other benefits, dependent on the position offered. This information is provided per the Colorado Equal Pay Act. Base pay information is based on market location. Applicants should apply via MTSI’s internal or external careers site #LI-MW-2 #MTSI #MTSIJOBS