Lead Information Systems Security Engineer (ISSE) - TS/SCI with Polygraph

Clearance Level Top Secret SCI + Polygraph Category Cyber and IT Risk Management Location Washington, District of Columbia (Onsite Workplace)

Key Skills For Success Information System Security

Plan of Action and Milestones (POA&M)

Risk Assessments

REQ#:RQ231083

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

-------------------

Transform technology into opportunity as a Lead Information Systems Security Engineer (ISSE) with GDIT. A career in enterprise IT means connecting and enhancing the systems that matter most. At GDIT you’ll be at the forefront of innovation and play a meaningful part in improving how agencies operate.

At GDIT, people are our differentiator. As a Lead Information Systems Security Engineer (ISSE) you will help ensure today is safe and tomorrow is smarter.

HOW A LEAD INFORMATION SYSTEMS SECURITY ENGINEER (ISSE) WILL MAKE AN IMPACT:

Lead & Ownership

• Serve as the lead engineer for security accreditation, guiding ISSMs, SCAs, PMs, and engineering teams through the entire RMF/ICD 503 lifecycle.

Drive systems to achieve ATD IATT* ATO, ensuring technical and documentation readiness at each gate.

• Act as the primary point of contact for customer security organizations, audit teams, and senior leadership.
• Mentor junior engineers and provide technical oversight across multiple projects.

Technical Security Engineering

• Conduct in‑depth technical reviews of system architectures and document security-relevant components for SSPs and CONOPS.
• Lead the development, review, and execution of all RMF/ICD 503 documentation, including SSP, CONOPS, Contingency Plans, User Guides, and SOPs.
• Review and update control volatility assessments based on evolving threats, IC policies, federal standards, and system sensitivity levels.
• Support Information Systems Continuous Monitoring (ISCM) activities, performing technical content reviews and recommending improvements.

A&A Execution and Compliance

• Track, document, and communicate A&A progress across multiple systems to customer leadership.
• Own POA&M development, mitigation strategies, and evidence collection from system owners and engineers.
• Provide audit liaison support for internal and external audits, delivering concise, actionable recommendations.
• Ensure ongoing compliance and readiness through proactive security oversight and risk assessments.

WHAT YOU’LL NEED TO SUCCEED:

• Required Education and Experience: Technical Training, Certification(s) or Degree + 10 years
• 10+ years of cybersecurity, information assurance, or security engineering experience.
• Cleareance: Active TS/SCI with Polygraph
• Certification Required: DoD Manual 8570.01-M at the Information Assurance System Architects & Engineer (IASAE Level II) role
• Experience mentoring or leading security teams.
• Direct experience leading A&A/ATO efforts for large or complex systems.
• Mastery of RMF, ICD 503, and IC accreditation processes.
• Strong technical writing expertise, especially in SSPs, CONOPS, POA&Ms, and audit documentation.
• Ability to translate complex engineering details into security artifacts and briefings.
• Location: On Customer Site

PREFERRED QUALIFICATIONS:

• Experience supporting DoW or Intelligence Community customers.
• Background in secure systems architecture or engineering.
• Familiarity with high-value assets, cross-domain systems, or TS/SCI mission systems.
• Experience leading A&A for Special Access Programs

GDIT IS YOUR PLACE:

• 401K with company match
• Comprehensive health and wellness packages
• Internal mobility team dedicated to helping you build your skills and 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 10 company-paid holidays

*

OWN YOUR OPPORTUNITY Explore a career in cyber at GDIT and you’ll find endless opportunities to grow alongside colleagues who share your focus on defending and protecting what matters.

#VA_2026Alumni

#MD_2026Alumni

#GDITEnhanced2026

#GDITCareers

#JET

Work Requirements

Years of Experience

10 + years of related experience

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

Certification

Travel Required

None

Citizenship

U.S. Citizenship Required

Salary and Benefit Information

The likely salary range for this position is $164,382 - $207,000. 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.

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