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Job Title: Information System Security Officer (ISSO) - TS/SCI with Polygraph
Company Name: General Dynamics IT
Location: McLean, VA
Position Type: Full Time
Post Date: 02/26/2026
Expire Date: 03/31/2026
Job Categories: Engineering, Information Technology
Job Description
Information System Security Officer (ISSO) - TS/SCI with Polygraph

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, DoW 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, DoW 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 YOULL NEED TO SUCCEED - REQUIRED:

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

Security clearance level: Must possess a current and active TS/SCI with Polygraph.

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 youll find endless opportunities to grow alongside colleagues who share your focus on defending and protecting what matters.

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Contact Information
Company Name: General Dynamics IT
Website:https://www.gdit.com/careers/job/845dd9fb8/information-system-security-officer-isso-tssci-with-polygraph/?source=AutoAppend_HBCU
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