Information Systems Security Engineer Security Clearance

Position: Information Systems Security Engineer with Security Clearance
Location: Rosslyn

Information Systems Security Engineer

Location:

Onsite | Rosslyn, VA
Clearance:
Secret or Top Secret/SCI security clearance

Employment Type:

Full-time, salaried, with full benefits The Company & Mission:
Our client is revolutionizing military logistics and sustainment through the deployment of AI-enabled solutions. Combining elite Silicon Valley software expertise with deep operational experience working in and with the Department of Defense, our client builds cutting-edge software to solve the most critical logistics challenges faced by the U.S. military and its allies. Their flagship product is an advanced software platform that enhances logistics at tactical and operational echelons, providing unified, comprehensive management of inventory, personnel, equipment, and distribution.

The platform integrates critical information for holistic, data-driven logistics decisions, leveraging AI for decision support, predictive analytics, and optimization at machine speed. Their mission is to support and enable the military logistics and sustainment communities with software to meet needs for the next fight. What This Role is All About:
Our client is seeking an Information Systems Security Engineer (ISSE) to own and drive the security posture of their platforms across classified and unclassified environments. In this role, you will operate at the intersection of software engineering, cybersecurity, and mission deployment—ensuring systems meet stringent DoD security requirements while remaining fast, scalable, and usable in real-world operational environments. You will work closely with engineering, product, and mission teams to embed security directly into their systems—from architecture through deployment—while navigating the realities of classified, air-gapped, and edge environments.

This is a high-ownership role for someone who can balance security rigor with execution speed. What You’ll Be Doing:
• Own the end-to-end security posture of systems across development, deployment, and sustainment

• Automate vulnerability scanning and document generation processes with CI/CD, scripting, and/or AI tools

• Lead and execute RMF processes, including system categorization, control selection, assessment, authorization, and continuous monitoring

• Develop and maintain security artifacts (e.g., SSPs, POA&Ms, control matrices) to support Authority to Operate (ATO)

• Tailor and implement NIST 800-53 controls and ensure compliance across cloud, edge, and air-gapped environments

• Partner with engineering teams to integrate secure design principles and Dev Sec Ops  practices into the software development lifecycle

• Conduct vulnerability assessments, security scans, and risk analyses, and drive remediation efforts

• Translate commercial technology standards into classified and operational environments

• Collaborate with Information System Owners, government stakeholders, and accrediting authorities to meet mission and compliance requirements

• Support deployment of secure systems in real-world environments, including field testing and operational validation

• Advise on security architecture, threat modeling, and secure coding practices across the platform

• Continuously improve monitoring, automation, and tooling to reduce accreditation and compliance overhead

What You Bring:

• Active U.S. Secret clearance

• 3–6+ years of experience in cybersecurity, ISSE, ISSO, ISSM, or related roles supporting DoD or classified systems

• Strong understanding of RMF, NIST SP 800-53, and DoD cybersecurity frameworks

• Experience supporting ATO processes and developing security documentation (SSP, POA&M, etc.)

• Familiarity with security assessment tools (e.g., Nessus, STIGs, vulnerability scanners)

• Working knowledge of software systems and infrastructure (cloud, networking, or embedded systems)

• Experience with at least one programming or scripting language (e.g., Python, Go, C++)

• Ability to operate in fast-paced, ambiguous environments with high ownership and accountability

• Strong communication skills and ability to work directly with technical and non-technical stakeholders

Bonus Points:

• Active Top Secret clearance

• Experience securing edge…