Senior Information System Security Officer (ISSO)

gdit; Fort Belvoir (VA); On-site; USD 164,000 - 201,000; Full time

Job summary

General Dynamics Information Technology (GDIT) seeks a highly motivated Information System Security Officer (ISSO) for the Defense Threat Reduction Agency (DTRA). You will oversee the DSMS suite (DIAMONDS, JADE, NIMACS), ensuring systems align with RMF, DoD directives, and agency security mandates.

Fort Belvoir, VA, on-site, five days a week. You will coordinate with government ISSMs, staff, and external agencies, develop ATO/ATC/POA&M documentation, and support ST&E planning while maintaining

Qualifications

• BA/BS or the equivalent combination of education, technical training, or work/military experience.
• 5+ years of IT experience with at least 5+ years ISSO experience.
• Must have working knowledge of DOW RMF (Risk Management Framework).
• Must meet DOW 8750 requirements and be eligible for IAM level II.

Responsibilities

• Performs Cybersecurity activities for a large Program; coordinates with government staff and agencies to assist in policy, standards, and procedures.
• Support in development and staffing of documentation related to ATO, ATC, IATT and POA&Ms.
• Assist in development and execution of required Security Test and Evaluation plans.
• Provide USG review of architecture docs, security impact analyses, and risk mitigation to support RMF for DoW IT authorization.
• Provide security design management control of build processes for servers, services, and endpoints.
• Ensure cybersecurity and vulnerability management practices are developed, implemented, and enforced.
• Conduct network and system audits for vulnerabilities using STIGs, DISA SCAP, ACAS, ESS Policy Auditor.

Skills

Information Systems

Information System Security

POA&M

Education

BA/BS or equivalent

Job description

Type of Requisition:

Regular

Clearance Level Must Currently Possess:

Top Secret

Clearance Level Must Be Able to Obtain:

Top Secret/SCI

Public Trust/Other Required:

None

Job Family:

Cyber and IT Risk Management

Job Qualifications:

Skills:

Information Systems, Information System Security, Plan of Action and Milestones (POA&M)

Certifications:

None

Experience:

5 + years of related experience

US Citizenship Required:

Yes

Job Description:

General Dynamics Information Technology (GDIT) seeks a highly motivated and experiencedInformation System Security Officer (ISSO) supporting the Defense Threat Reduction Agency (DTRA). You will be the designated cybersecurity professional responsible for the Defense Stockpile Management Systems (DSMS) which includes: Defense Integration and Management of Nuclear Data Services (DIAMONDS), Joint Application Design Environment (JADE), Nuclear Inventory Management and Cataloging System (NIMACS). The ISSO ensures all systems comply with theNIST Risk Management Framework (RMF), DoD directives, and agency-specific security mandates.

WHAT YOU WILL DO:

• Performs Cybersecurity activities for a large Program; coordinates with government Program staff, DTRA, and other government agencies to assist in the creation, dissemination, direction, and auditing of program policy, standards, and operating procedures.

• Support the government ISSMs in the development and staffing of documentation related to the Authorization to Operate (ATO), Authorization to Connect (ATC), Interim Authorization to Test (IATT), Plans of Action & Milestones (POA&Ms), etc.

• Assist in the development and execution of any required Security Test and Evaluation (ST&E) plans.

• Provide USG with a review of architecture documentation, security impact analysis, and risk mitigation/acceptance to support RMF for DoW IT authorization.

• Provide security design management control of build processes for servers, services, and end points.

• Ensure good cybersecurity and vulnerability management practices are developed, implemented, and enforced.

• Conduct network and system audits for vulnerabilities using Security Technical Implementation Guides (STIGs), DISA SCAP, ACAS vulnerability scanner, ESS Policy Auditor to mitigate those findings for Linux, Windows, Cisco, Juniper, VMWare and other associated operating systems and technologies.

• Implement the Continuous Monitoring program by creating, tracking, reviewing, and closing Plan of Action and Milestones (POA&Ms) and Risk Acceptances and assist in conducting solution identification to assist in problem remediation and resolution.

• Communicate tactical and strategic threat information to Government leaders, Cybersecurity-Ops and Security Staff to assist them in making cyber risk decisions and to mitigate threats.

• Carries out DoW Risk Management Framework (RMF) in accordance with DoW 8510 to ascertain information systems’ security posture by utilizing security control validation activities and coordinating security testing.

• Coordinates with DTRA and other organizations in support of audits and inspections and provides all necessary documentation as required for SAVs, ST&Es, and CCRI

• Evaluate change requests (firewall, systems, networks) and assess organizational risk.

• Ensures the integrity and protection of networks, systems, and applications by technical enforcement of organizational security policies, through monitoring of vulnerability scanning devices.

• Provides guidance and work leadership to less‑experienced technical staff members.

• Maintains current knowledge of relevant technology as assigned.

• Process tickets in support of the program using the accepted ITSM system.

WHAT YOU WILL NEED:

• BA/BS or the equivalent combination of education, technical training, or work/military experience.

• 5+ years of IT experience with at least 5+ years ISSO experience.

• Must have working knowledge of DOW Risk Management Framework (RMF)

• Must meet DOW 8750 requirements and be eligible for IAM level II

• Required clearance: must have an active/current Top Secret/SCI (TS/SCI) Security Clearance.

• Ability to work in a team‑oriented, collaborative environment.

• Ability to work efficiently in a fast‑paced environment and multi‑task while still ensuring high quality of work.

• Highly organized with strong ability to prioritize work and work autonomously.

• Excellent verbal and written communication skills

• Great attention to detail and presentation

• Results driven, highly efficient, energetic, and highly motivated.

• Must possess a high degree of intelligence, competence, maturity, adaptability, resilience, integrity, and initiative.

• The work is typically performed at client site locations, which requires proper safety precautions; work may require some physical effort in the handling of light materials, boxes, or equipment.

• Work location is on site at Fort Belvoir, VA. Not a remote or hybrid role and must be able to work on site 5 days a week.

WHAT GDIT CAN OFFER:

• 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

#ARMA

#GDITPRIORITY

The likely salary range for this position is $164,382 - $201,250. 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.

40

Less than 10%

Onsite

USA VA Fort Belvoir

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.

Our Identity Verification Process:

As part of the hiring process, we will ask you to complete an identity verification process that leverages advanced biometrics and artificial intelligence to ensure authenticity and protect against identity fraud. You are expected to be on camera during virtual interviews. We reserve the right to take your picture to verify your identity and prevent fraud. By proceeding, you authorize the collection, processing, and use of your biometric data for identity verification and security purposes.

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