On-Site ISSO: DoD RMF & Cyber Defense

Leidos; Lorton (VA); On-site; USD 87,000 - 157,000; Full time

Job summary

Leidos Defense Sector seeks an Information System Security Officer (ISSO) to support a fast-paced Air Force LCMC program. This on-site role oversees the cybersecurity posture of DoD information systems, develops policies, and conducts risk assessments to ensure compliance with DoD standards.

You will collaborate with cross-functional teams, maintain RMF accreditation, and provide security training. Required Top Secret/SCI eligibility and DoD certifications.

Qualifications

• The candidate has a U.S. citizenship and active Top Secret clearance with SCI eligibility.
• Degree: Bachelor’s (4+ years) or Master’s (2+ years) with relevant cybersecurity experience.
• In-depth knowledge of DoD cybersecurity policies and frameworks (NIST 800-53, RMF, FISMA, JSIG, ICD 503/705).
• Experience with cloud computing and obtaining an ATO for cloud-based systems.
• Must hold a DoD 8140 Intermediate certification (e.g., Cloud+, Security+).
• Experience in system security engineering, risk management, and vulnerability assessments.
• Proficiency in network security, security controls, and SIEM/IDS/IPS tools.
• Ability to work independently and communicate security findings effectively.

Responsibilities

• Collaborate daily with the ISSO and provide cybersecurity guidance.
• Develop, implement, and maintain security policies, procedures, and documentation per DoD standards.
• Oversee the security posture of DoD information systems for confidentiality, integrity, and availability.
• Conduct risk assessments, vulnerability assessments, and security audits with remediation strategies.
• Manage continuous monitoring of security controls and protect data (classified and unclassified).
• Coordinate with cross-functional teams to enforce security controls and best practices.
• Ensure RMF accreditation is maintained and compliant with applicable requirements.
• Serve as primary security contact for incident response and reporting to leadership and government customers.
• Provide security training and awareness programs for operational personnel.
• Maintain SSPs, risk assessments, and POA&Ms with up-to-date documentation.
• Stay current with emerging cybersecurity threats and trends to adapt the program.

Skills

Top Secret Clearance

Cloud Security

DoD RMF/NIST

Vulnerability Assessments

Security Engineering

Network Security

DoD 8140 cert

Security Policies

Independent Worker

Communication Skills

Education

Bachelor's degree

Master's degree

Tools

SIEM

Firewalls

IDS/IPS

Endpoint Security

Job description

Leidos Defense Sector seeks an Information System Security Officer (ISSO) to support a fast-paced Air Force LCMC program. This on-site role oversees the cybersecurity posture of DoD information systems, develops policies, and conducts risk assessments to ensure compliance with DoD standards.

You will collaborate with cross-functional teams, maintain RMF accreditation, and provide security training. Required Top Secret/SCI eligibility and DoD certifications.