The Department of Homeland Security (DHS) has a continuing requirement for Homeland Enterprise Information Technology Secure Services and Support (HEITS) for the continued operations, maintenance and evolution of the Homeland Secure Data Network (HSDN) and the Classified Local Area Network (C-LAN). The System Administrator will support the administration, operation, maintenance, and security of enterprise information technology systems. The selected candidate will manage Windows and/or Linux server environments, support system availability and performance, apply patches and updates, resolve technical issues, and ensure systems operate in accordance with customer security, configuration-management, and operational requirements.
The System Administrator will work closely with network engineers, cybersecurity personnel, application teams, service desk staff, and government stakeholders to maintain reliable, secure, and mission-ready IT services.
Primary Responsibilities- Administer, configure, maintain, and troubleshoot Windows Server and/or Linux operating systems.
- Manage user accounts, groups, permissions, and access controls in Active Directory and related identity-management services.
- Perform system monitoring, event-log review, capacity management, and performance tuning.
- Apply operating system patches, security updates, and configuration changes in accordance with approved change-management procedures.
- Support vulnerability remediation efforts and maintain compliance with applicable security requirements, including STIGs and customer security policies.
- Maintain server documentation, system inventories, standard operating procedures, and configuration records.
- Support backup, recovery, continuity-of-operations, and disaster-recovery activities.
- Investigate and resolve escalated hardware, software, operating system, and access-related incidents.
- Coordinate with cybersecurity, networking, cloud, application, and service-management teams to resolve complex technical issues.
- Participate in system upgrades, migrations, testing, deployments, and technology-refresh activities.
- Provide technical status updates, incident documentation, and operational reports to management and government stakeholders.
- Participate in on-call, after-hours, or maintenance-window support as required by the program.
- Bachelor’s degree in information technology, Computer Science, Cybersecurity, Engineering, or a related field, plus 2-4 years of relevant experience; additional relevant experience may be substituted for education in accordance with contract requirements.
- At least 2+ years of experience administering Windows Server, Linux, or mixed enterprise server environments.
- Experience with Microsoft Active Directory, Group Policy, DNS, DHCP, file services, and access management.
- Experience performing system patching, vulnerability remediation, and configuration management.
- Familiarity with system monitoring, log analysis, troubleshooting, and incident-resolution processes.
- Experience using ticketing and IT service-management tools, such as ServiceNow, Remedy, or a comparable platform.
- Knowledge of cybersecurity principles, least privilege, secure configuration practices, and applicable security controls.
- Ability to create and maintain technical documentation, procedures, and operational reports.
- Strong written and verbal communication skills and the ability to work effectively in a team environment.
Preferred Qualifications
- Current CompTIA Security+ CE or other DoD 8570/8140-aligned certification, if required by the contract.
- Microsoft, Red Hat, VMware, AWS, Azure, or other relevant technical certifications.
- Experience implementing or maintaining DISA Security Technical Implementation Guides (STIGs).
- Experience with VMware vSphere, virtualized environments, storage platforms, or backup and recovery tools.
- Experience with scripting and automation using PowerShell, Bash, Python, Ansible, or similar tools.
- Experience supporting cloud or hybrid-cloud infrastructure.
- Experience supporting DHS, federal civilian, or other regulated government IT environments.
- Familiarity with Agile, DevSecOps, Infrastructure as Code, or automated configuration-management practices.
- DHS EOD
- Security Vetting for up to TS/SCI
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.
Original Posting:November 9, 2026For U.S. Positions: While subject to change based on business needs, Leidos reasonably anticipates that this job requisition will remain open for at least 3 days with an anticipated close date of no earlier than 3 days after the original posting date as listed above.
The Leidos pay range for this job level is a general guideline only and not a guarantee of compensation or salary. Additional factors considered in extending an offer include (but are not limited to) responsibilities of the job, education, experience, knowledge, skills, and abilities, as well as internal equity, alignment with market data, applicable bargaining agreement (if any), or other law.
Skills Required
- Bachelor’s degree in information technology, Computer Science, Cybersecurity, Engineering, or a related field, plus 2–4 years of relevant experience; equivalent additional experience may substitute for education.
- At least 2 years of experience administering Windows Server, Linux, or mixed enterprise server environments.
- Experience with Microsoft Active Directory, Group Policy, DNS, DHCP, file services, and access management.
- Experience performing system patching, vulnerability remediation, and configuration management.
- Familiarity with system monitoring, log analysis, troubleshooting, and incident-resolution processes.
- Experience using ticketing and IT service-management tools such as ServiceNow, Remedy, or comparable platforms.
- Knowledge of cybersecurity principles, least privilege, secure configuration practices, and applicable security controls.
- Ability to create and maintain technical documentation, procedures, and operational reports.
- Strong written and verbal communication skills and ability to work effectively in a team environment.
- Current CompTIA Security+ CE or another DoD 8570/8140-aligned certification, if required by contract.
- Microsoft, Red Hat, VMware, AWS, Azure, or other relevant technical certifications.
- Experience implementing or maintaining DISA Security Technical Implementation Guides.
- Experience with VMware vSphere, virtualized environments, storage platforms, or backup and recovery tools.
- Experience with scripting and automation using PowerShell, Bash, Python, Ansible, or similar tools.
- Experience supporting cloud or hybrid-cloud infrastructure.
- Experience supporting DHS, federal civilian, or other regulated government IT environments.
- Familiarity with Agile, DevSecOps, Infrastructure as Code, or automated configuration-management practices.
- DHS EOD.
- Security vetting for up to TS/SCI.
Leidos Compensation & Benefits Highlights
The following summarizes recurring compensation and benefits themes identified from responses generated by popular LLMs to common candidate questions about Leidos and has not been reviewed or approved by Leidos.
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Healthcare Strength — Healthcare coverage is described as comprehensive, with multiple plan options, low office-visit copays in some plans, and access to mental health and wellness support tools. The availability of HSA/FSA options and employer contributions is positioned as a meaningful part of the total package.
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Retirement Support — Retirement benefits are framed as a strong component of total rewards, highlighted by a 401(k) match and immediate vesting in the standard package. The Employee Stock Purchase Plan is also presented as an additional long-term wealth-building feature.
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Wellbeing & Lifestyle Benefits — Wellbeing and lifestyle supports extend beyond core insurance, including wellness programs, fitness-related stipends, and assistance resources. Work flexibility and related perks are also included as part of the broader rewards experience.
Leidos Insights
What We Do
We Are Leidos For 50 years we have been tackling some of the biggest problems that face our nation and our world. OUR MISSION Through our culture of innovation and history of performance, we develop deep customer trust built on integrity and create enduring solutions that improve our world. Leidos is a science and technology solutions leader working to address some of the world’s toughest challenges in the defense, intelligence, homeland security, civil, and healthcare markets. The company’s 43,000 employees support vital missions for government and commercial customers. Headquartered in Reston, Va., Leidos reported annual revenues of approximately $11.09 billion for the fiscal year ended January 3, 2020. Leidos was cited for the meaningful work employees perform that is challenging, impactful, and aligned with our customers’ missions as reasons professionals want to work and stay at our company. Leidos has also been named to lists including Forbes’ Best Employers for Diversity, Forbes’ America’s Best Employers for Women, Military Times Best for Vets Employers, and Ethisphere Institute’s World's Most Ethical Companies®. Employees enjoy career enrichment opportunities available through mobility and development and experience rewarding relationships with supportive supervisors and talented colleagues and customers. Employees appreciate our flexible work environment, allowing for and encouraging a true work-life balance. Our professionals are also excited about our Employee Resource Groups, like the newly launched Collaborative Outreach with Remote and Embedded Employees (CORE), which strives to create an environment where every employee, regardless of location, feels fully engaged as a valued employee of Leidos. Your most important work is ahead.
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