Systems Engineer

Leidos LLC; Chantilly (VA); On-site; USD 108,000 - 195,000; Full time

Job summary

Leidos is seeking a Senior Systems Engineer to design, build, and sustain Windows-based systems within multi-domain enclaves. The role covers domain services, AD integration, and COTS like Citrix, Exchange, and SQL Server, with PKI, ePO endpoint security, and PowerShell automation.

The candidate should have a TS/SCI with poly, 8+ years of relevant experience (or 6+ with a Master’s), and a strong background in Windows domain engineering and security baselines.

Qualifications

• Bachelor's degree required; 8+ years experience or Master’s with 6+ years, or 12+ years in lieu of degree.
• Must have a TS/SCI with poly to be considered.
• Strong knowledge of Windows Active Directory, Group Policy; WSUS and patching.

Responsibilities

• Windows Domain Engineering & Systems Lifecycle Design, build, integrate, and maintain Windows-based systems across enclave environments.
• Administer and maintain Active Directory environments supporting domain-joined systems and services.
• Engineer secure and scalable Windows Server environments supporting core services.
• Support PKI and certificate services and certificate lifecycle management.

Job description

Systems Engineer – Windows Domain & Integration

Looking for an opportunity to make an impact? At Leidos, we deliver innovative solutions through the efforts of our diverse and talented people who are dedicated to our customers’ success. We empower our teams, contribute to our communities, and operate sustainable. Everything we do is built on a commitment to do the right thing for our customers, our people, and our community. Our Mission, Vision, and Values guide the way we do business. If this sounds like the kind of environment where you can thrive, keep reading!

Leidos Intelligence Group uses a wide range of capabilities in Digital Modernization, Mission Software Systems, and enabling technologies like Artificial Intelligence and Machine Learning to support our customers’ mission to defend against evolving threats around the world. Our team’s focus is ensuring our intelligence customers have the right tools, technologies, and tactics to keep pace with an ever-evolving security landscape and succeed in their pursuit to protect people and critical assets.

Your greatest work is ahead! We are seeking a Senior Systems Engineer responsible for the design, build, integration, and lifecycle management of Windows-based systems within complex enclave environments.

This role focuses on delivering and sustaining reliable, secure, and interoperable system capabilities across Windows server infrastructure, domain services, and integrated COTS applications.

The position centers on Windows domain engineering, including Active Directory administration, Group Policy architecture, and integration of core services such as Citrix, Microsoft Exchange, and Microsoft SQL Server.

The role also includes support for endpoint security enforcement using Trellix ePolicy Orchestrator (ePO), as well as certificate and PKI services that support authentication and secure communications across systems.

This environment consists of multiple independent systems and domains supporting a wide range of COTS and engineering applications. These may include collaboration and workflow tools (such as Jira, Confluence, and SharePoint) as well as engineering platforms (such as SolidWorks and MATLAB).

Deep expertise in any single application is not required; success in this role depends on the ability to integrate and sustain interoperability across diverse systems. The role requires strong engineering discipline, the ability to manage multiple concurrent efforts, and the flexibility to support both design and operational activities as needed.

Responsibilities

• Windows Domain Engineering & Systems Lifecycle Design, build, integrate, and maintain Windows-based systems across enclave environments
• Engineer system-level solutions spanning domain services, server infrastructure, and integrated applications
• Support modernization and sustainment of existing systems and platforms
• Active Directory & Domain Services Administration
• Administer and maintain Active Directory environments supporting domain-joined systems and services
• Engineer secure and scalable Windows Server environments supporting core services
• Support PKI and certificate services, including certificate lifecycle management and integration with domain and application services
• Utilize PowerShell to automate routine administrative tasks, streamline operational workflows, and support system configuration and troubleshooting activities
• Create and maintain technical documentation including design artifacts and as-built documentation for system designs and integrations
• Group Policy Design & Management Design, implement, and maintain Group Policy Objects (GPOs) to enforce configuration and security standards
• Troubleshoot Group Policy inheritance, replication, and application issues
• Maintain baseline configurations for domain-joined systems across the enclave
• Application & COTS Integration Integrate and support systems within Active Directory environments, including Microsoft Exchange, Microsoft SQL Server, and Citrix environments
• Support authentication, authorization, and service integration across diverse COTS and engineering platforms
• Ensure interoperability between infrastructure services and mission applications, including certificate-dependent services
• Endpoint Security & Systems Management Support endpoint security configuration and policy enforcement using Trellix ePolicy Orchestrator (ePO)
• Ensure systems comply with established security baselines and organizational requirements
• Collaborate with security teams to support vulnerability remediation and enforcement activities
• Systems Integration & Collaboration Work closely with application owners, network engineers, storage teams, and security teams to support integration across enclave systems
• Resolve cross-platform integration challenges spanning identity, infrastructure, and application layers
• Support troubleshooting across interconnected systems
• Operational Support & Sustainment Provide operational support as required to maintain stability of domain and server environments
• Support incident response and infrastructure issue resolution as part of engineering ownership

Required Experience, Skills, and Education

• Requires a Bachelor degree and at least 8 years of experience or Master and at least 6 years of experience OR at least 12 years of experience in lieu of degree.
• Must have a TS/SCI with poly to be considered.
• Must have strong knowledge of Windows Active Directory, Group Policy and must understand WSUS and third party software patching.
• Integrate and support systems within Active Directory environments, including Microsoft Exchange, Microsoft SQL Server, and Citrix environments.

Preferred Experience, Skills, and Education

The following skills are not primary ownership areas but are valuable for effective collaboration across enclave infrastructure teams:

• NetApp storage systems and SAN concepts
• Nutanix virtualization and HCI environments
• FSLogix profile/containerization in VDI environments
• Citrix virtualization and application delivery concepts
• Multi-factor authentication platforms and identity integration patterns
• Data center replication and disaster recovery concepts (replication, failover, site resilience)
• Development and maintenance of operational runbooks and procedures

Clearance Required

TS/SCI with Poly You will be required to pass both a customer required and administered medical and psychological screening, as a condition of employment #MSBA

If you're looking for comfort, keep scrolling. At Leidos, we outthink, outbuild, and outpace the status quo — because the mission demands it. We're not hiring followers. We're recruiting the ones who disrupt, provoke, and refuse to fail. Step 10 is ancient history. We're already at step 30 — and moving faster than anyone else dares.

Leidos Leidos is an industry and technology leader serving government and commercial customers with smarter, more efficient digital and mission innovations. Headquartered in Reston, Virginia, with 47,000 global employees, Leidos reported annual revenues of approximately $17.2 billion for the fiscal year ended January 2, 2026. For more information, visit www.Leidos.com.

Pay Range: $107,900.00 - $195,050.00

Pay and benefits are fundamental to any career decision. That's why we craft compensation packages that reflect the importance of the work we do for our customers. Employment benefits include competitive compensation, Health and Wellness programs, Income Protection, Paid Leave and Retirement.

Securing Your Data

Leidos will never ask you to provide payment-related information at any part of the employment application process. And Leidos will communicate with you only through emails that are sent from a Leidos.com email address. If you receive an email purporting to be from Leidos that asks for payment-related information or any other personal information, please report the email to [e-mail].

Commitment and Diversity

All qualified applicants will receive consideration for employment without regard to sex, race, ethnicity, age, national origin, citizenship, religion, physical or mental disability, medical condition, genetic information, pregnancy, family structure, marital status, ancestry, domestic partner status, sexual orientation, gender identity or expression, veteran or military status, or any other basis prohibited by law. Leidos will also consider for employment qualified applicants with criminal histories consistent with relevant laws.