Description
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.
Required Qualifications
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
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Original Posting:
November 9, 2026
For 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.
Pay Range:
Pay Range $59,150.00 - $106,925.00
The Leidos pay range for this job level is a general guideline onlyand 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.
About 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 $16.7 billion for the fiscal year ended January 3, 2025. For more information, visit www.Leidos.com .
Pay and Benefits
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. More details are available at www.leidos.com/careers/pay-benefits .
Securing Your Data
Beware of fake employment opportunities using Leidos' name. Leidos will never ask you to provide payment-related information during any part of the employment application process (i.e., ask you for money), nor will Leidos ever advance money as part of the hiring process (i.e., send you a check or money order before doing any work). Further, Leidos will only communicate with you through emails that are generated by the Leidos.com automated system - never from free commercial services (e.g., Gmail, Yahoo, Hotmail) or via WhatsApp, Telegram, etc. If you received an email purporting to be from Leidos that asks for payment-related information or any other personal information (e.g., about you or your previous employer), and you are concerned about its legitimacy, please make us aware immediately by emailing us at LeidosCareersFraud@leidos.com .
If you believe you are the victim of a scam, contact your local law enforcement and report the incident to the U.S. Federal Trade Commission (https://reportfraud.ftc.gov/#/) .
Commitment to Non-Discrimination
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.
REQNUMBER: R-00196559
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/disability/vet.
