Sr. Principal Information System Security Officer (ISSO) (TS/SCI with Polygraph Clearance Required)

General Dynamics IT; McLean (VA); On-site; USD 140,000 - 190,000; Full time

Benefits offered by this job

Comprehensive benefits

401K with company match

Paid time off

Job summary

General Dynamics Information Technology, Inc. is seeking a highly skilled Information System Security Officer (ISSO) for a critical contract role supporting a commercial cloud service provider's mission-critical systems.

This on-site position in McLean, VA requires a Top Secret/SCI clearance and DoD 8570 compliance. You will contribute to RMF/A&A, continuous monitoring, and GRC efforts, working to secure IL6 classified cloud services and cross-domain solutions, coordinating with ISSM and 3PAO

Qualifications

• BA/BS Degree or equivalent experience
• 5+ years of related experience
• Current and active Top Secret SCI Polygraph clearance
• DoD 8140/8570-M compliant certifications
• Expert knowledge of NIST SP 800 series and risk management

Responsibilities

• Support RMF & A&A implementation for classified cloud services
• Assist in maintaining evidence for A&A packages
• Coordinate FedRAMP/DoW IL6 and 3PAO assessments
• Support continuous monitoring and GRC activities
• Prepare for security control audits and inspections

Skills

Security clearance

DoD 8140/8570

RMF/A&A

NIST SP 800 series

FedRAMP IL6

ATO for IL6

Communication to leadership

Risk management

Education

BA/BS Degree

Tools

FedRAMP

IL6

3PAO

Job description

GDIT is seeking a highly skilled and multi-faceted Information System Security Officer (ISSO) for a critical contract role supporting a commercial cloud service provider's mission-critical systems. This position requires the employee to report full time on site in McLean, VA.

The ideal candidate is a proactive and seasoned professional with extensive, hands‑on experience navigating the FedRAMP, Impact Level 6 (IL6), and Risk Management Framework (RMF) requirements for classified commercial cloud services and cross domain solutions. This role requires a unique blend of technical engineering prowess, security assessment and auditing skills, deep expertise in continuous monitoring, and the polish to communicate risk to executive leadership. You will be a key contributor to our Governance, Risk, and Compliance (GRC) program, supporting the Information System Security Manager (ISSM) and ISSO Lead in ensuring the unyielding security and integrity of mission‑critical systems.

The ISSO will support the following key areas -

• RMF & Assessment and Authorization (A&A)
• Security Engineering & System Hardening
• Security Control Assessor (SCA) & Auditing
• Continuous Monitoring & GRC

Additionally, the ISSO will -

• Support Assessment & Authorization (A&A) execution for classified commercial cloud service offerings, and Cross Domain Solutions (CDS) as needed, through the entire respective FedRAMP/DoW IL6 and/or RMF lifecycles to obtain and maintain the applicable authorizations.
• Assist in maintaining a comprehensive body of evidence for A&A packages.
• Support the monthly and overall FedRAMP/DoW IL6, CDS as needed, and IC Continuous Monitoring requirements.
• Work with security engineering to proactively identify and assess vulnerabilities related to scans, STIGs, security controls, etc.
• Support assessment preparation for security control audits, traditional security reviews, and formal inspections, including preparing for and executing FedRAMP/IL6 third‑party assessment organization (3PAO) assessments, DoW CDS assessments as needed, and IC assessments. (Potential to support DCSA classified space assessments.)
• Meticulously review artifacts, logs, and system configurations to ensure they provide sufficient evidence of compliance.
• Coordinate and/or participate in security testing and penetration testing activities to provide an independent validation of the system's security posture.

WHAT YOU’LL NEED TO SUCCEED - REQUIRED:

Bring your cyber expertise and drive for innovation to GDIT. TheISSO must have:

• Security clearance level: Must possess a current and active Top Secret SCI Polygraph clearance
• Certifications: Must be DoW 8140 / 8570.01-M compliant
• Education: BA/BS Degree or equivalent experience in lieu of degree
• Experience: 5+ years of related experience
• Technical skills:
  • ----- Expert-level knowledge of the complete NIST SP 800 series (especially 800-37, 800-53, 800-30) and risk management principles.
  • ----- Progressive experience in information assurance and cybersecurity roles.
  • ----- Direct, hands‑on experience as an ISSO or ISSM, with a proven track record of successfully supporting ATO for classified systems under IL6, DoW RMF, and/or ICD 503 policies.
  • ----- Extensive, hands‑on experience navigating the FedRAMP, DoW Impact Level 6 (IL6), and Risk Management Framework (RMF) requirements for classified commercial cloud services and cross domain solutions.
• Location: Onsite in McLean, VA

DESIRED QUALIFICATIONS:

• Certifications: CISSP (Certified Information Systems Security Professional)

GDIT IS YOUR PLACE

At GDIT, the mission is our purpose, and our people are at the center of everything we do.

• Growth: AI-powered career tool that identifies career steps and learning opportunities
• Support: An internal mobility team focused on helping you achieve your career goals
• Rewards: Comprehensive benefits and wellness packages, 401K with company match, and competitive pay and paid time off
• Community: Award-winning culture of innovation and a military-friendly workplace

OWN YOUR OPPORTUNITY

Explore a career in cyber at GDIT and you’ll find endless opportunities to grow alongside colleagues who share your focus on defending and protecting what matters.