Sr. Windows Systems Administrator TS/SCI Poly

Leidos LLC; Maryland; On-site; USD 116,000 - 210,000; Full time

Benefits offered by this job

Health benefits

Paid time off

11 holidays

401K with 6% match

Education and training support

Parental paid leave

Flexible schedules

Job summary

Leidos is seeking a Senior Windows System Administrator to join a high-performing agile team within the SAFe framework, supporting a complex, fast-paced program across a broad geographic footprint. The role emphasizes system administration, O&M, and security operations for VMware, Windows, Linux, and VDI environments.

The candidate will monitor infrastructure, manage AD/ DNS/ GPOs, perform patching and vulnerability remediation, and maintain robust documentation while coordinating with partner

Qualifications

• Bachelor’s degree in Computer Science or related field, plus 12 years of experience or equivalent.
• Minimum 7 years Windows administration experience.
• 7+ years in information security management and governance.
• 5+ years with AD, DNS, GPOs, SCCM, Exchange administration.
• Proficient in Windows PowerShell and scripting; strong security fundamentals.

Responsibilities

• Monitor and maintain Windows servers and VDI across multiple sites.
• Configure servers, routers, firewalls, and security controls per SSPs.
• Perform vulnerability scanning, IAVA management, and remediation.
• Respond to incidents and coordinate with cross-functional teams.
• Document procedures, updates, and status communications to users.

Skills

Windows administration

Information security governance

Active Directory

DNS

Group Policy Objects

PowerShell

VMware

IAVA management

Education

Bachelor’s degree in Computer Science/IT or related field

Tools

SCCM

Exchange Management Shell

VDI

Job 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).

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

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: o Implementing and managing Windows Active Directory and DNS environments o Creating and managing Group Policy Objects (GPOs) o Microsoft SCCM o 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.

Pay Range

Pay Range $116,350.00 - $210,325.00

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 here.

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.