Sr. Windows Systems Administrator TS/SCI Poly

Leidos; Annapolis (MD); On-site; USD 116,000 - 210,000; Full time

Benefits offered by this job

Paid Time Off

11 paid Holidays

401K with 6% company match

Flexible schedules

Education and training support

Job summary

Leidos is seeking a Senior Windows System Administrator to join a high‑performing Agile team operating within the SAFe framework in support of a fast‑paced program. The selected candidate will provide daily systems administration and O&M across multiple systems with a broad geographic footprint.

Key responsibilities include deploying and sustaining new capabilities, monitoring infrastructure, and ensuring timely remediation of vulnerabilities. A TS/SCI with Polygraph clearance is required.

Qualifications

• Bachelor's degree in Computer Science, Information Technology, or a related technical field; 12 years of prior relevant experience may substitute for a degree.
• Must have at least 7 years of Windows administration experience.
• Must have at least 7 years of information security management experience with governance, risk, and compliance expertise.
• Must have 5+ years with Windows AD/DNS, GPOs, SCCM, Exchange administration and PowerShell.
• Strong knowledge of security protocols and information security principles.
• Hands-on IAVA management experience.
• Experience with Windows and Linux operating systems, VMware, networking.
• Clearance: TS/SCI with Polygraph.

Responsibilities

• Monitor test infrastructure systems, applications, and processes; identify, track, and resolve issues.
• Configure and support server, router, firewall; perform security management and performance optimization.
• Provide cross-team support and maintain interdepartmental collaboration.
• Manage IAVAs and system security scans per System Security Plans; remediate vulnerabilities.
• Initiate IAVA responses, deploy patches, and run routine security scans monthly.
• Identify and resolve hardware and software problems; communicate outages and publish status updates.
• Author and maintain documentation; respond to calls and emails promptly.
• Plan IT enhancements and support project-related work; be on-call when required.

Skills

Windows administration

PowerShell

IAVA management

Active Directory

DNS

GPOs

SCCM

Exchange Admin

Security governance

VMware

Networking basics

On-call support

Education

Bachelor's degree in Computer Science/Information Technology or related field

Tools

VMware

Ansible

SaltStack

Job description

Description

Senior Windows System Administrator; requires TS/SCI Polygraph up front.

Leidos has a new and exciting opportunity for a Senior Windows System Administrator in our Intel Sector's Cyber & Analytics Business Area (CABA). Our talented team is at the forefront in Security Engineering, Computer Network Operations (CNO), Mission Software, Analytical Methods and Modeling, Signals Intelligence (SIGINT), and Cryptographic Key Management. At Leidos, we offer competitive benefits, including Paid Time Off, 11 paid Holidays, 401K with a 6% company match and immediate vesting, Flexible Schedules, Discounted Stock Purchase Plans, Technical Upskilling, Education and Training Support, Parental Paid Leave, and much more. Join us and make a difference in National Security!

Job Summary

Leidos is seeking a Senior Windows System Administrator to join a high-performing Agile team operating within the Scaled Agile Framework (SAFe) in support of a complex, fast-paced program. In this role, the selected candidate will provide daily systems administration and operations and maintenance support across multiple systems with a broad geographic footprint. Key responsibilities include responding to system engineering requests that support operational requirements, as well as engineering, deploying, and sustaining new capabilities within the environment.

Primary Responsibilities

The selected candidate will be responsible for monitoring test infrastructure systems, applications, and processes to ensure issues are identified, tracked, and resolved in a timely manner. This role also includes supporting server, router, and firewall configuration, as well as performing security management and application performance optimization activities in an environment made up of VMware server hosts, Windows and Linux guest servers, and Virtual Desktop Infrastructure (VDI).

Additional responsibilities include:

• Maintaining multiple virtual server clusters and addressing system scan findings, vulnerability management patching, and Active Directory configuration issues.
• Using enterprise monitoring tools to detect, assess, and respond to alerts.
• Providing technical support to partner workgroups on overlapping efforts while maintaining strong interdepartmental collaboration.
• Managing Information Assurance Vulnerability Alerts (IAVAs) and system security scanning in accordance with applicable System Security Plans, ensuring vulnerabilities are identified and remediated quickly and accurately.
• Initiating IAVA responses and system security scans, completing remediation actions, deploying patches and security updates to designated sites, and executing monthly security scans.
• Identifying and resolving hardware and software problems.
• Proactively notifying customers when test infrastructure delays may affect their ability to complete business functions on time and communicating system outages and publishing status updates to users, as needed.
• Authoring and maintaining clear, accurate, and concise documentation.
• Responding to calls and emails in a timely and professional manner.
• Planning and implementing IT enhancements and supporting project-related work.
• Responding to system administration, operations, and maintenance issues on an on-call basis when required.

Basic Qualifications

• Bachelor's degree in Computer Science, Information Technology, or a related technical field and 12 years of prior relevant experience. Additional experience may be substituted for a degree.
• Must have at least 7 years of Windows administration experience.
• Must have at least 7 years of experience in information security management, with demonstrated expertise in security governance, risk management, compliance, and operational security functions.
• Must have at least 5 years of experience with each of the following:
• Implementing and managing Windows Active Directory and DNS environments
• Creating and managing Group Policy Objects (GPOs)
• Microsoft SCCM
• Microsoft Exchange administration and Exchange Management Shell
• Must have experience with Windows Command Line, PowerShell, and PowerShell scripting.
• Strong understanding of advanced security protocols, standards, and information security principles is a must.
• Experience with software and security architectures.
• Hands-on experience with IAVA management.
• Hands-on experience supporting users, optimizing system operations, and monitoring enterprise IT systems.
• Commitment to best practices, including compliance with maintenance windows and change control procedures.
• Familiarity with Windows and Linux operating systems, VMware, and networking technologies including switches, routers, LANs, and cabling.
• Must have strong analytical skills, attention to detail, and the ability to work effectively both independently and as part of a team.
• Clearance Required: Must have TS/SCI with Polygraph.

Preferred Qualifications

• Experience documenting and supporting security accreditation and certification activities.
• Experience with network security technologies, including multi-domain solutions, PKI, SSPs, and vulnerability assessments.
• Experience with data center design and configuration, including rack-and-stack, power planning, and equipment placement.
• Experience with VMware.
• Experience using automation tools such as Ansible or SaltStack.
• Experience serving in a System Administrator role supporting software configuration management and development environments.

At Leidos, the opportunities are boundless. We challenge our staff with interesting assignments that allow them to thrive professionally and personally. For us, helping you grow your career is good business. We look forward to learning more about you –

August 28, 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 $116,350.00 - $210,325.00

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 [e-mail].

If you believe you are the victim of a scam, contact your local law enforcement and report the incident to U.S. Federal Trade Commission.

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.