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AMERICAN SYSTEMS

Info System Security Officer (ISSO)

Ashburn, VA, United States

$110,800 to $185,100 USD / year

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Job details

Pay: $110,800 to $185,100 USD / year
Apply by: Nov 2, 2027
Experience: Senior ISSO candidates should demonstrate approximately 5–10 years of relevant information systems security, cybersecurity, or security authorization experience.
Posting language: English
Posted: Nov 2, 2026

Original job description

Overview

AMERICAN SYSTEMS is an employee-owned federal government contractor supporting national priority programs through our strategic solutions in the areas of Information Technology, Test & Evaluation, Program Mission Support, Engineering & Analysis, and Training. We are seeking an Information System Security Officer (ISSO) to support a Network Operations Center Network Management Support Services. The ISSO will serve as a designated security professional for one or more FISMA systems of record and new information systems, supporting the Assessment and Authorization (A&A) lifecycle, Authority to Operate (ATO) activities, ongoing authorization, continuous monitoring, vulnerability management, and compliance with government security requirements. This role will work closely with the Government Program Manager, Technical POC/Task Manager, Information Systems Security Manager (ISSM), COR, system owners, engineers, and security stakeholders.

Responsibilities

Perform ISSO duties in accordance with DHS 4300A, HB 1400-05D, FISMA guidance, applicable NIST publications, and approved program SOPs.
Lead or support the Assessment and Authorization (A&A), reaccreditation, and continuous-monitoring processes for assigned information systems.
Notify security leadership of upcoming accreditation or reaccreditation requirements and coordinate reaccreditation kickoff activities with the agency's Security Authorization Team.
Support the transition of designated systems to Ongoing Authorization (OA), also known as continuous monitoring.
Manage Plans of Action and Milestones (POA&Ms), including development, documentation, SME follow-up, remediation tracking, and status reporting.
Review Information Security Vulnerability Management (ISVM) messages, determine applicability, acknowledge notifications, track remediation, and coordinate POA&M creation for unresolved vulnerabilities.
Review weekly network scans and log information; prepare vulnerability summaries and identify critical and high-risk issues affecting assigned systems.
Maintain accurate system asset inventories and provide updates to the Vulnerability Assessment Team (VAT); reconcile system inventories with DHS detailed asset reports.
Review proposed change requests to verify that changes comply with security standards and update asset records and System Security Plans (SSPs) when systems or configurations change.
Develop, review, maintain, and submit A&A and security documentation for Government approval, including SSPs, risk assessments, FIPS 199 categorization assessments, ST&E plans and results, ATO and ATT artifacts, contingency plans, ISAs, waivers, and POA&Ms.
Review and update SSPs annually or when significant system changes occur; complete annual NIST SP 800-26 or NIST SP 800-53 assessments as required.
Prepare documentation and support the annual Ongoing Authorization Review Management Board (OARMB), DHS/CISA/OMB audits, cybersecurity data calls, and FedRAMP or cloud-as-a-service activities, as applicable.
Assist the Computer Security Incident Response Center (CSIRC) with investigations of security violations and incidents.
Support encryption and security compliance requirements, including FIPS 197 AES-256, FIPS 140-2 validated cryptographic modules, NSA Type 1 or
Type 2 encryption, PKI, and emerging FIPS 203, 204, and 205 requirements.
Prepare weekly ISSO reports covering ATO activities, assessments, audits, change requests, POA&Ms, ISVMs, waivers, compliance highlights, and issues requiring management guidance.

Qualifications

Senior ISSO candidates should demonstrate approximately 5–10 years of relevant information systems security, cybersecurity, or security authorization experience. Candidates supporting junior-level ISSO assignments.
In-depth knowledge of the Risk Management Framework (RMF), NIST publications, FISMA, DHS 4300A, and HB 1400-05D.
Assessment and Authorization: Demonstrated experience implementing or assessing NIST SP 800-53 controls and supporting A&A, ATO, reaccreditation, or continuous-monitoring activities.
Experience reviewing Nessus or comparable vulnerability scans, tracking ISVMs, managing remediation, and developing or maintaining POA&Ms in an enterprise environment.
Experience preparing or maintaining SSPs, security assessments, risk assessments, contingency plans, ST&E artifacts, ATO packages, waivers, and related security documentation.
Understanding of enterprise networking concepts, infrastructure, architectures, and configuration changes.
Ability to work effectively in a team environment, build rapport with Government and customer organizations, and communicate technical security issues clearly.
Education: Bachelor’s degree in cybersecurity, information assurance, computer science, information systems, or a related field is preferred; equivalent relevant experience may be considered.

Preferred Qualifications

Experience supporting a federal or other mission-critical enterprise network operations environment.

Security Clearance

Ability to obtain Public Trust, Preferred Secret/Top Secret Clearance

Certifications

CISSP, Security+, Network+, CISA, CAP, or security auditing certification recommended.

Pay Transparency Statement AMERICAN SYSTEMS is committed to pay transparency for our applicants and employee-owners. The salary range for this position is USD $110,800.00/Yr. - USD $185,100.00/Yr. Actual compensation will be determined based on several factors permitted by law. AMERICAN SYSTEMS provides for the welfare of its employees and their dependents through a comprehensive benefits program by offering healthcare benefits, paid leave, retirement plans, insurance programs, and education and training assistance. EEO Statement EEO Race/Sex/Disability Status/Veteran Status

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