Sr. Principal Information System Security Officer (ISSO) (Full-Scope Polygraph Clearance Required)

General Dynamics Information Technology, Inc.; McLean (VA); On-site; USD 187,000 - 252,000; Full time

Job summary

General Dynamics Information Technology, Inc. is seeking an Information System Security Officer (ISSO) for a critical contract role. The position is onsite in McLean, VA and requires a current Top Secret SCI with Polygraph.

The ISSO will navigate FedRAMP/IL6, RMF, and cross‑domain solution requirements for classified commercial cloud services and contribute to the GRC program. The role emphasizes risk communication to executives, articulating security posture and mitigating vulnerabilities, with

Qualifications

• Security clearance: current Top Secret SCI with Full-Scope Polygraph
• DoW 8140 / 8570.01‑M compliant certifications
• BA/BS degree or equivalent experience
• Minimum 5+ years of related experience

Responsibilities

• Support RMF & A&A activities for classified systems
• Perform security engineering and system hardening
• Act as Security Control Assessor (SCA) and conduct audits
• Support continuous monitoring, governance, risk, and compliance (GRC) activities

Skills

Information Assurance

Penetration Testing

Risk Assessments

Security Evaluations

Security Reviews

Education

BA/BS Degree

Job description

Information System Security Officer (ISSO)

Type of Requisition: Pipeline Clearance Level Must Currently Possess: Top Secret SCI + Polygraph Clearance Level Must Be Able to Obtain: Top Secret SCI + Polygraph Public Trust/Other Required: None Job Family: Cyber and IT Risk Management Job Qualifications: Skills: Information Assurance, Penetration Testing, Risk Assessments, Security Evaluations, Security Reviews Certifications: None Experience: 5 + years of related experience US Citizenship Required: Yes

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.

Key Responsibilities

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

• Security clearance level: Must possess a current and active Top Secret SCI Full‑Scope 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)

Recruiter / Employer Overview / Culture

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.

The likely salary range for this position is $186,542 - $252,380. This is not, however, a guarantee of compensation or salary. Rather, salary will be set based on experience, geographic location and possibly contractual requirements and could fall outside of this range.

Work Arrangements & Schedule

Scheduled Weekly Hours: 40 Travel Required: Less than 10% Telecommuting Options: Onsite Work Location: USA VA McLean Additional Work Locations:

Total Rewards at GDIT: Our benefits package for all US-based employees includes a variety of medical plan options, some with Health Savings Accounts, dental plan options, a vision plan, and a 401(k) plan offering the ability to contribute both pre and post‑tax dollars up to the IRS annual limits and receive a company match. To encourage work/life balance, GDIT offers employees full flex work weeks where possible and a variety of paid time off plans, including vacation, sick and personal time, holidays, paid parental, military, bereavement and jury duty leave. To ensure our employees are able to protect their income, other offerings such as short and long‑term disability benefits, life, accidental death and dismemberment, personal accident, critical illness and business travel and accident insurance are provided or available. We regularly review our Total Rewards package to ensure our offerings are competitive and reflect what our employees have told us they value most.

About Our Work

We are GDIT. A global technology and professional services company that delivers technology solutions and mission services to every major agency across the U.S. government, defense and intelligence community. Our 26,000 experts extract the power of technology to create immediate value and deliver solutions at the edge of innovation. We operate across 50+ countries worldwide, offering leading mission‑ready capabilities in AI, cloud, cyber and software development.

Join our Talent Community to stay up to date on our career opportunities and events at gdit.com/tc.

Equal Opportunity Employer / Individuals with Disabilities / Protected Veterans Opportunity Owned From working with technologies like AI, cyber and cloud to careers in intelligence and health, we offer endless opportunities to apply your expertise to create a safer, smarter world.