Information System Security Officer (ISSO) - SCIF Office Location: Onsite role - Reston, VA Clearance Required: Active TS/SCI with Full Scope Polygraph Number of Positions: 1

Seeking a Information System Security Officer (ISSO) to serve as the security authorization authority for classified information systems operating within a SCIF environment. This is a systems security function focused on authorization, control enforcement, and compliance oversight. This role is responsible for ensuring systems are authorized, continuously monitored, and compliant with the NIST Risk Management Framework (RMF) and applicable Intelligence Community Directives (ICD 503, ICD 704, ICD 705).

Key Responsibilities

System Authorization & RMF Governance

Own the Authorization to Operate (ATO) lifecycle for classified systems

Develop and maintain System Security Plans (SSPs) and RMF documentation

Lead security assessments, authorization decisions, and reauthorization activities

Ensure alignment with NIST 800-53 control requirements

Continuous Monitoring & Risk Management

Operate continuous monitoring (ConMon) programs for in-scope systems

Track and manage vulnerabilities, control gaps, and remediation activities

Ensure timely resolution of findings impacting system authorization status

Security Governance & Control Independence

Enforce segregation of duties between system administration and security authorization

Validate that system changes are properly reviewed, approved, and documented

Maintain oversight of privileged access and security-relevant system modifications

Engineering & Platform Collaboration

Partner with Agency infrastructure, platform, and application teams on secure system design and operation

Provide security requirements during system deployment and change activities

Support remediation of audit findings and control deficiencies

Required Qualifications

5-8 years of experience in ISSO, ISSM, or equivalent systems security role

Active TS/SCI with Full Scope Polygraph

Completion of an IC ISSO training program (or equivalent)

Strong experience with NIST RMF and ATO lifecycle management

Experience developing and maintaining SSPs and security authorization packages

Working knowledge of ICD 503, ICD 704, ICD 705

Experience operating in classified or SCIF environments

Strong understanding of NIST 800-53 security controls and assessment processes

Ability to work independently in a highly regulated environment

Strong documentation, communication, and audit readiness skills

Preferred Experience

Prior experience supporting IC or DoD classified system environments

Experience with continuous monitoring (ConMon) and control automation

Background in cloud, hybrid, or on-prem classified infrastructure environments

Experience supporting security assessments, ATO renewals, and audit remediation

Familiarity with enterprise security and vulnerability management tooling

Education

Bachelor’s degree in Cybersecurity, Information Systems, Computer Science, or related field preferred; equivalent experience considered.

Certifications & Licenses

TS/SCI with Full Scope Polygraph