# Lead Information Systems Security Engineer (ISSE)

**Company**: GDIT
**Location**: Washington, DC
**Work arrangement**: onsite
**Experience**: senior
**Job type**: full-time
**Salary**: $164,382 - $207,000
**Category**: Security
**Industry**: Technology

**Apply**: https://gdit.wd5.myworkdayjobs.com/en-US/External_Career_Site/job/USA-DC-Washington/Lead-Information-Systems-Security-Engineer--ISSE----TS-SCI-with-Polygraph_RQ231083-1?utm_source=yubhub.co&utm_medium=jobs_feed&utm_campaign=apply
**Canonical**: https://yubhub.co/jobs/job_3a0f49b8-d8d

## 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.

**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.

**Requirements**

- 10+ years of cybersecurity, information assurance, or security engineering experience.

- Active TS/SCI with Polygraph clearance.

- 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.

**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

**Benefits**

- 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

## Skills

### Required
- Information System Security
- Plan of Action and Milestones (POA&M)
- Risk Assessments
- RMF
- ICD 503
- IC accreditation processes
- Technical writing

### Nice to have
- DoW
- Intelligence Community customers
- Secure systems architecture
- High-value assets
- Cross-domain systems
- TS/SCI mission systems
- Special Access Programs

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Source: [Apply at gdit.wd5.myworkdayjobs.com](https://gdit.wd5.myworkdayjobs.com/en-US/External_Career_Site/job/USA-DC-Washington/Lead-Information-Systems-Security-Engineer--ISSE----TS-SCI-with-Polygraph_RQ231083-1?utm_source=yubhub.co&utm_medium=jobs_feed&utm_campaign=apply)