Senior Information System Security Engineer - TS/SCI with Polygraph

Public Trust: None

Requisition Type: Regular

Your Impact

Own your opportunity to serve as a critical component of our nation’s safety and security. Make an impact by using your expertise to protect our country from threats.

Job Description

Senior Information System Security Engineer

Deliver security related solutions for enterprise information systems and network architectures as an Information System Security Engineer at GDIT. Here, you’ll tailor cutting-edge solutions to the unique requirements of our clients. With a career in systems security, you’ll ensure information systems, networks and architectures are secure and ready to support mission critical requirements.

At GDIT, people are our differentiator. As an Information System Security Engineer, you will help ensure today is safe and tomorrow is secure. Our work depends on Information Systems Security Engineers joining our team to protect data flows for a wide range of devices.

HOW AN INFORMATION SYSTEM SECURITY ENGINEER WILL MAKE AN IMPACT

• Provides technical expertise to ensure systems meet Information Assurance (IA) requirements and are properly accredited.
• Designs, develops, and recommends integrated security system and physical control solutions that will ensure proprietary/confidential data and systems are protected.
• Assist IA team in established Authorization and Accreditation (A&A) process using a risk mitigation framework (RMF) across the design lifecycle for classified systems obtaining and maintaining Interim Authorization to Test (IATT), Authority to Connect (ATC) and Authorization to Operate (ATO).
• Offers technical engineering services for the support of integrated security systems and solutions, managing information-related risks effectively.
• Works closely with the client during the strategic design process to translate security and business requirements into actionable technical designs.
• Develop comprehensive system test plans (STP) to assess the security posture of the information systems.
• Analyze scan results and security findings to prioritize remediation efforts and implement corrective measures.

WHAT YOU’LL NEED TO SUCCEED:

• Education: Bachelor Degree in an area applicable to this position
• Required Experience: 8+ years of related experience
• Advanced Windows administration capabilities and Linux proficiency
• Practical experience deploying, maintaining, and troubleshooting security tools
• Experience with C2S Cloud, or DevOpsSec
• Required Technical Skills: Must be 8570 compliant (IAT Level 2) by date of security indoctrination with any necessary certifications.
• Security Clearance Level: TS/SCI and Poly
• Experience with: Assured Compliance Assessment Solution (ACAS), Trellix, Splunk, and Security Technical Implementation Guide (STIG)’s.
• Required Skills and Abilities: Excellent communication, problem solving, team player
• Experience as an ISSO, ISSM, ISSE, or Security Controls Assessor. 
• Experience with Special Access Programs (SAPs) and Intelligence Community.
• Location: On Customer Site
• US Citizenship Required

GDIT IS YOUR PLACE:

• 401K with company match
• Comprehensive health and wellness packages
• Internal mobility team dedicated to helping you own your career
• Professional growth opportunities including paid education and certifications
• Cutting-edge technology you can learn from
• Rest and recharge with paid vacation and holidays

#VA_2026Alumni

#GDITEnhanced2026

#GDITCareers

#JET

Work Requirements

Years of Experience

8 + years of related experience

* may vary based on technical training, certification(s), or degree

Certification

Travel Required

None

Citizenship

U.S. Citizenship Required