Senior Security Engineer

Muon Space is hiring a Senior Security Engineer to protect its satellites, ground systems, mission networks, cloud infrastructure, data, and people. The role advances security controls and practices across aerospace mission systems, supports compliance efforts including CMMC and NIST SP 800-171, and contributes to threat monitoring and incident response.

Responsibilities:

• Design and implement cybersecurity controls for satellite software, ground systems, communication links, and mission infrastructure
• Develop secure software practices for mission systems, including threat modeling, code reviews, vulnerability management, and security testing
• Monitor mission networks and satellite systems for cyber threats, investigate incidents, and coordinate containment and recovery
• Collaborate with aerospace, software, systems, and compliance teams to ensure missions meet security, safety, and regulatory requirements
• Own network security architecture including firewall rule management, IDS/IPS tuning, network segmentation, and VPN infrastructure
• Assess vulnerabilities in flight software, embedded systems, command-and-control interfaces, and satellite communication protocols, and coordinate remediation with engineering teams
• Administer and harden IAM systems (Okta, AWS IAM) including SSO integrations, conditional access policies, privilege access reviews, and lifecycle automation
• Develop and maintain security monitoring and alerting using SIEM platforms, building detection rules and response playbooks
• Conduct security assessments of new tools, vendors, and architectural changes before deployment
• Drive cloud security posture management across AWS environments including IAM policies, S3 bucket security, security group reviews, and CloudTrail/GuardDuty monitoring
• Support CMMC Level 2 and NIST SP 800-171 compliance — maintain SSP control narratives, collect evidence, and prepare for assessments
• Develop and deliver security awareness training and phishing simulation campaigns
• Lead or support incident response activities including containment, forensic analysis, root cause determination, and post-incident reporting
• Maintain and improve data loss prevention (DLP) controls for CUI and sensitive data
• Contribute to security policy development and keep documentation current as the environment evolves

Requirements:

• 5+ years of experience in information security or security engineering roles
• Active TS/SCI clearance, or eligibility to obtain one
• Familiarity with satellite communication protocols, embedded systems, and RF or space-ground link security
• Experience securing aerospace or mission systems — satellites, ground systems, embedded/flight software, or command-and-control (C2) interfaces
• Experience with secure software practices — threat modeling, code review, security testing, and vulnerability management
• Deep understanding of identity and access management principles and hands-on Okta or Azure AD administration
• Proficiency with cloud security in AWS (IAM, VPC, Security Groups, CloudTrail, GuardDuty, Config)
• Experience with SIEM platforms (Splunk, Sentinel, Elastic, or similar) for log analysis and detection engineering
• Solid networking knowledge — firewalls, proxies, DNS security, network segmentation, packet analysis
• Familiarity with compliance frameworks such as NIST 800-171, CMMC, SOC 2, or ISO 27001
• Excellent written and verbal communication skills — able to convey risk and technical findings to both engineers and leadership
• applicant must either be (A) a U.S. person, defined as a (i) U.S. citizen or national, (ii) U.S. lawful, permanent resident (green card holder), (iii) refugee under 8 U.S.C. § 1157, or (iv) asylee under 8 U.S.C. § 1158, (B) eligible to access the export controlled information without a required export authorization, or (C) eligible and reasonably likely to obtain the required export authorization from the applicable U.S. government agency
• Relevant certifications (CISSP, GIAC, CEH, AWS Security Specialty, or similar)
• Experience with infrastructure-as-code security (Terraform, CloudFormation) and CI/CD pipeline security
• Background in environments subject to ITAR/EAR export control requirements
• Experience supporting U.S. Government, DoD, or national security space programs