Mission Security Engineer III

Responsibilities

• Implement end-to-end security controls for ground-based C2 systems, spacecraft hardware and software platforms, spanning firmware, embedded systems, cloud-native applications, and operational technology
• Ensure security architectures enable effective monitoring, logging, and incident response without compromising operational tempo
• Implement and validate DISA STIG requirements at the OS, container, platform, and application layers within products as they are developed
• Integrate RMF controls into CI/CD pipelines through DevSecOps practices including Infrastructure as Code (IaC), automated security scanning, and continuous monitoring tooling
• Identify and remediate findings from STIGs, vulnerability scans, penetration testing, and SCA activities to maintain ATO posture
• Ensure compliance with NIST 800-53, CNSSI 1253, ICD 503, JSIG, and other applicable frameworks for National Security Systems (NSS) handling classified information up to TS/SCIS
• Serve as a credible technical voice with government ISSOs, ISSEs, and third-party assessors during ATO and reauthorization activities
• Contribute technically to security artifacts including SSPs, SAPs, SARs, and POA&Ms

Requirements

• 3–5 years of combined experience in a technical IT field, security engineering, DevSecOps, and/or software development
• Active Top Secret clearance with SCI eligibility required
• DoD 8140 IAT Level II certification (Security+, CySA+, or equivalent) required
• Experience implementing or utilizing NSA Type 1 cryptographic solutions in operational systems
• Working knowledge of NIST SP 800-53 security controls and how they map to technical implementation
• Familiarity with space system architectures including satellite operations, ground segments, and TT&C systems
• Bachelor's degree in Computer Science, Cybersecurity, Engineering, or related field (or equivalent experience)

Qualifications

• Active TS/SCI clearance with polygraph
• Direct experience securing C2 systems, space systems, or other DoD mission systems
• Direct experience within IL-5 or IL-6 impact level cloud environments
• Familiarity with Cross Domain Solutions (CDS), data guards, or other information flow control technologies
• Experience with FedRAMP High, CMMC, or DoD IL-5/IL-6 authorizations
• Experience integrating security tooling (e.g., SIEMs, vulnerability scanners, audit/logging systems) into development workflows
• Understanding of zero trust architectures and modern identity solutions applied to classified environments

Work Environment

• Fast-paced, mission-critical environment supporting national security space operations
• Requires coordination across distributed teams including spacecraft engineers, ground operations, and government partners
• May require participation in on-call rotation for security incident response and mission-critical system support
• Occasional travel to government sites, launch facilities, or partner locations may be required