Senior ISSO – RMF & A&A Expert for DoD Systems

The Mission Essential Group; Fairfax (VA); On-site; USD 120,000 - 135,000; Full time

Benefits offered by this job

Competitive salary

Medical, dental, vision insurance

Life and disability insurance

Paid time off

Retirement benefits

Job summary

The Mission Essential Group in Fairfax, VA is seeking an Information Systems Security Officer (ISSO) to support RMF activities, ATO processes, and continuous monitoring for DoD/IC systems. This role centers on applying security controls, vulnerability management, and risk assessment in a high-security environment.

Based at MEG’s Fairfax, VA headquarters, the ISSO collaborates with ISSMs, engineers, and assessors to ensure compliance, maintain authorization readiness, and implement security

Qualifications

• Active TS clearance.
• Bachelor’s degree in computer science, Information Systems, Cybersecurity, Information Technology.
• Minimum of five (5) years of Cyber Security experience.
• Minimum of three (3) years of RMF experience per NIST SP 800-37 Rev. 2.
• Working knowledge of NIST/NIST SP 800-60, SP 800-53 Rev. 5, CNSSI 1253 Rev. 5, DoDI 8510.01 and related processes.
• Experience supporting SIPRNet-connected systems and environments.
• Current CompTIA Security+ certification or equivalent DoD 8570/8140 baseline.
• Experience managing RMF packages and authorization activities using eMASS and/or Xacta.

Responsibilities

• Support RMF package development, security control implementation, assessment, continuous monitoring, and ATO processes using eMASS and/or Xacta.
• Verify changes that may impact security posture are documented and communicated to stakeholders.
• Serve as liaison between system owners, ISSMs, engineers, assessors, and cybersecurity stakeholders.
• Ensure day-to-day implementation, oversight, and compliance of multiple information systems.
• Lead meetings to identify, document, validate, and track cybersecurity requirements.
• Conduct vulnerability assessments and security scans using Nessus, SCAP, and approved tools.
• Implement and track corrective actions for incidents, vulnerabilities, or deficiencies.
• Develop and maintain Security Control Traceability Matrices (SCTMs).
• Stay current with federal and DoD cybersecurity policies and standards.

Skills

TS clearance

RMF

NIST SP 800-37

Windows Server

eMASS/Xacta

Cyber Security

CompTIA Security+

Education

Bachelor’s degree in computer science/Information Systems/Cybersecurity/IT

Tools

eMASS

Xacta

Nessus

SCAP Checker

Job description

The Mission Essential Group in Fairfax, VA is seeking an Information Systems Security Officer (ISSO) to support RMF activities, ATO processes, and continuous monitoring for DoD/IC systems. This role centers on applying security controls, vulnerability management, and risk assessment in a high-security environment.

Based at MEG’s Fairfax, VA headquarters, the ISSO collaborates with ISSMs, engineers, and assessors to ensure compliance, maintain authorization readiness, and implement security