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

General Dynamics Information Technology, Inc.; Washington (District of Columbia); On-site; USD 140,000 - 210,000; Full time

Benefits offered by this job

401K with company match

Comprehensive health and wellness

Internal mobility

Professional growth (education/certs)

Cutting-edge technology

Paid vacation and holidays

Job summary

General Dynamics Information Technology, Inc. in Washington, DC seeks a Lead Information Systems Security Engineer (ISSE) to guide RMF/ICD 503 lifecycle, drive ATO readiness, and serve as primary security liaison with customers and senior leadership at on-site engagements.

The role emphasizes ownership, technical security engineering, and documented artifacts such as SSPs, CONOPS, POA&M, and audit responses, with mentoring responsibilities across multiple projects.

Qualifications

• 10+ years of cybersecurity, information assurance, or security engineering experience.
• Mastery of RMF, ICD 503, and IC accreditation processes.
• Strong technical writing expertise, especially in SSPs, CONOPS, POA&M, and audit documentation.

Responsibilities

• Serve as the lead engineer for security accreditation and guide RMF/ICD 503 lifecycle.
• Drive ATD/IATT/ATO to ensure readiness at each gate and maintain customer security liaison.
• Review and develop RMF/ICD 503 documentation including SSP, CONOPS, Contingency Plans, User Guides, and SOPs.
• Track A&A progress, own POA&M development, and provide audit liaison support.
• Mentor junior engineers and provide technical oversight across multiple projects.

Skills

Security engineering

RMF/ICD 503

A&A leadership

Technical writing

Mentoring

ISCM experience

Education

IASAE II certification

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&M, 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.