Remote Senior Security Risk Leader — NIST/Compliance

ArcTern Ventures; United States; Hybrid; USD 154,000 - 207,000; Full time

Job summary

Muon Space is seeking a Senior Security Risk Engineer to join our Security Engineering & IT team. You will lead risk assessments, maintain a live risk register, and drive remediation with engineering, IT, and operations to reduce risk exposure across the company.

You will map risks to compliance requirements such as NIST 800-171 and CMMC, report trends to leadership, and help teams build risk-aware processes while ensuring alignment with ITAR/EAR considerations and enterprise-wide governance.

Qualifications

• 5+ years in information security or security risk roles.
• Hands-on experience running security risk assessments and managing a risk register.
• Strong understanding of security risk frameworks and methodologies (e.g., NIST RMF / 800-30, FAIR, or similar).
• Familiarity with compliance frameworks such as NIST 800-171, CMMC, SOC 2, or ISO 27001.

Responsibilities

• Lead security risk assessments across the company — identify, analyze, and prioritize risks across engineering, IT, operations, and business functions
• Maintain a risk register and a clear, current view of Muon's risk posture for leadership
• Partner with teams across the company to drive remediation of identified risks and track them to closure
• Assess the security risk of new tools, vendors, third parties, and architectural or process changes before adoption
• Define and apply a consistent risk framework and methodology — likelihood and impact scoring, risk acceptance, and exceptions
• Map risks and controls to compliance requirements such as NIST 800-171 and CMMC, and support audits and assessments
• Report risk trends and metrics to leadership and recommend where to invest to reduce the most risk
• Help teams build risk-aware processes and take ownership of the risks they hold

Skills

Security risk management

Risk assessments

NIST/FRM/800-30

Security communications

Industry certifications

ITAR/EAR knowledge

Job description

Muon Space is seeking a Senior Security Risk Engineer to join our Security Engineering & IT team. You will lead risk assessments, maintain a live risk register, and drive remediation with engineering, IT, and operations to reduce risk exposure across the company.

You will map risks to compliance requirements such as NIST 800-171 and CMMC, report trends to leadership, and help teams build risk-aware processes while ensuring alignment with ITAR/EAR considerations and enterprise-wide governance.