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From the employer's careers site First seen 4 Nov 2026

Information System Security Officer (ISSO)

GDIT McLean, VA On-site senior full-time

Salary

$186,542 - $252,380 per year

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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.
  • 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)

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.

Skills

Required

  • Information Assurance
  • Penetration Testing
  • Risk Assessments
  • Security Evaluations
  • Security Reviews
  • NIST SP 800 series
  • risk management principles
  • cybersecurity
  • FedRAMP
  • DoW Impact Level 6 (IL6)
  • Risk Management Framework (RMF)

Nice to have

  • CISSP (Certified Information Systems Security Professional)
Apply on GDIT