Information Systems Security Engineer

Leidos; Reston (VA); On-site; USD 140,000 - 190,000; Full time

Job summary

Leidos invites experienced ISSE professionals to lead security architecture across unclassified, classified, and corporate networks. The role spans AWS multi-region, hybrid cloud, and CDS design to enable secure data sharing between agencies and enterprise systems.

The ideal candidate holds a TS/SCI clearance with poly, BS degree plus 4–8 years’ experience, and deep knowledge of RMF, NIST 800-53, and vendor tools like Kubernetes, Docker, VMware. Expect a dynamic, mission-focused environment.

Qualifications

• U.S. Citizenship is required.
• Active TS/SCI, or Top Secret clearance with SSBI, eligible for TS/SCI w/ poly.
• BS degree with 4–8 years of relevant experience; degree optional with experience.
• Deep understanding of security principles across unclassified and classified networks.
• Cloud security in AWS and cloud-native architectures across security levels.
• Experience interfacing with DTRA and DIA networks and assessment lifecycles.
• Experience with container platforms managed via Kubernetes and Docker.
• Cross Domain Solution technologies, data labeling, and secure transport is essential.

Responsibilities

• Design, integrate, test, and operate Cross Domain Solutions for secure data transfers.
• Engineer secure AWS architectures across GovCloud, commercial regions, and Secret/Top Secret areas.
• Coordinate security compliance across DTRA, DIA, and corporate infrastructures.
• Oversee secure deployment and integration of applications supporting government and corporate networks.
• Maintain SSPs and authorization artifacts in eMASS with NIST 800-53 controls.
• Lead vulnerability management including ACAS/Nessus, AWS Security Hub, Prisma Cloud.
• Liaise with Authorizing Officials and ISSOs to obtain and maintain Authority to Operate.

Skills

Security architecture

Cross Domain Solutions

Cloud security

Vulnerability management

RMF/Compliance

Agency liaison

Kubernetes

Docker

Education

BS degree

Tools

Kubernetes

Docker

VMware

Azure Virtual Desktop

Citrix

eMASS

Job description

Description

Leidos is seeking an experienced Information Systems Security Engineer (ISSE) to lead the security architecture, design, and deployment of mission‑critical applications across unclassified, classified, and corporate networks. This role is highly dynamic, requiring a security SME who can bridge network boundaries across DTRA, DIA, and corporate infrastructures leveraging AWS multi‑region and hybrid cloud environments. The ideal candidate will design robust Cross Domain Solutions (CDS) and ensure compliant application deployments across multiple government and commercial domains.

Key Responsibilities

• Cross Domain Architecture: Design, integrate, and test Cross Domain Solutions (CDS) allowing secure, policy‑compliant data transfers and multi‑level data sharing between unclassified and classified environments.

• AWS Cloud Security: Engineer and maintain secure application architectures within AWS (Commercial, GovCloud, and Secret/Top Secret regions) using cloud‑native security tools, IAM policies, and VPC configuration.

• Multi‑Agency Security Integration: Coordinate security compliance and boundary protection architectures across differing DTRA, DIA, and corporate infrastructures.

• Secure Application Deployment: Oversee the secure deployment and integration of applications across both high‑side and low‑side systems, ensuring compatibility with both government networks and corporate enterprise baselines.

• RMF & Compliance Management: Author and maintain System Security Plans (SSPs) and authorization artifacts within eMASS, aligning security controls across NIST 800‑53, ICD 503, FedRAMP, and agency‑specific overlays.

• Vulnerability Management: Perform routine system audits, analyze vulnerability scans (e.g., ACAS/Nessus, AWS Security Hub, Prisma Cloud), and guide technical teams through STIG remediation and continuous monitoring.

• Government Liaison: Serve as the primary security liaison with Authorizing Officials (AOs), ISSOs, and external stakeholders from DTRA, DIA, and corporate leadership to achieve and maintain reciprocity and Authority to Operate (ATO).

Required Qualifications

• U.S. Citizenship is required.

• Candidate must possess an active TS/SCI, or a Top Secret clearance with a current SSBI, and be eligible to obtain a TS/SCI w/ poly level clearance.

• Requires deep understanding of and ability to apply principles, theories, and concepts of the technical domain and has broad understanding of other related specialty areas.

• Typically requires a BS degree and 4–8 years of prior relevant experience; certifications, education, and relevant work experience will be considered in lieu of a degree.

• Cloud Expertise: Deep knowledge of AWS security controls, Windows/Linux server administration, shared responsibility models, and cloud‑native architecture across disparate security classification levels.

• Agency‑Specific Knowledge: Direct experience working within or interfacing with DTRA and DIA networks, security processes, and assessment/authorization lifecycles; includes experience with VMware, Azure virtual desktop, and Citrix.

• Experience with container platforms managed via Kubernetes and Docker.

• CDS/Multi‑Level Security: Deep understanding of Cross Domain Solution technologies, data labeling, guard configurations, and secure data transport mechanisms.

• Hybrid Systems Engineering: Proven ability to securely integrate government mission systems with commercial/corporate infrastructures, maintaining strict data separation.

Preferred Qualifications

• Certifications: Active DoD 8570/8140 IAT/IASAE Level III certification (e.g., CISSP, CASP+). AWS Certified Security‑Specialty or AWS Solutions Architect certification is highly preferred.

Equal Opportunity Employment

All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, disability, or veteran status. Leidos will consider qualified applicants with criminal histories for employment in accordance with relevant laws. Leidos is an equal‑opportunity employer.