System Administrator

Leidos; Virginia; Hybrid; USD 116,000 - 210,000; Full time

Benefits offered by this job

Paid Time Off

11 paid Holidays

401K with 6% match

Flexible schedules

Job summary

Leidos is seeking a Senior Windows System Administrator to support a complex, fast-paced program. The role requires TS/SCI eligibility and a minimum Secret clearance, with 75% remote work and occasional travel to Warner Robins AFB, GA.

You will manage Windows/Linux infrastructure, Active Directory, and security controls within a DoD framework. Responsibilities include monitoring, deployment, and performance optimization, plus mentoring junior staff and producing documentation to sustain

Qualifications

• Bachelor's degree in IT, CS, Engineering or related field with 12+ years experience or equivalent.
• 7+ years Windows systems administration experience, 3+ years in senior/lead role.
• 5+ years with Active Directory, DNS, Group Policy and core Windows services.
• Active TS/SCI eligibility or ability to obtain TS/SCI within 365 days.
• Strong Hyper-V, VMs, clustering, storage; Windows Server 2022/2025.

Responsibilities

• Monitor and administer systems, applications, and processes; identify and resolve issues.
• Support servers, security management, performance optimization for Windows/Linux environments.
• Lead installation, administration, and troubleshooting of Windows Server, Hyper-V, VMs, and storage.
• Manage Active Directory, DNS, DHCP, GPO, NPS, PKI; oversee backups, DR, monitoring.
• Drive vulnerability remediation, STIG compliance, and RMF/ATO activities with cybersecurity teams.
• Develop technical documentation, SOPs, diagrams, and recovery procedures.
• Mentor junior staff and collaborate across engineering, cybersecurity, and program teams.

Skills

Windows administration

Active Directory

DNS policy

PowerShell scripting

DoD cybersecurity

Vulnerability scanning

RMF/ATO support

Hyper-V

Networking basics

Documentation & SOPs

Education

Bachelor's degree in IT, Computer Science, Engineering

Tools

Hyper-V

Windows Server 2022/2025

Storage systems

PowerShell

Job description

Description

Join a team committed to a mission!

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.

Are you ready for your next career challenge?

Leidos is seeking a Senior Windows System Administrator (requires minimum Secret clearance and individual must qualify for TS SCI) to join our high-performing team 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 supporting operational requirements, as well as engineering assistance, deploying, and sustaining new capabilities within the environment.

You will be working a hybrid schedule - remote and occasionally at Robins AFB - and be part of our talented team at the forefront of technology. 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!

This position 75% remote but will require travel to the customer site on Warner Robins Air Force Base in Warner Robin GA. Ideal candidate will be located in the travel region of Robins Air Force Base Georiga.

Primary Responsibilities:

The selected candidate will be responsible for monitoring and administrating systems, applications, and processes to ensure issues are identified, tracked, and resolved in a timely manner.

This role also includes supporting servers, as well as performing security management and application performance optimization activities in an environment made up of window Hyper-Server hosts, Windows and Linux servers, and network devices.

Additional responsibilities include:

• Serve as a senior technical SME responsible for designing, implementing, maintaining, and supporting enterprise IT infrastructure.
• Lead the installation, administration, and troubleshooting of Windows Server, Linux, Hyper-V clusters, virtual machines, and storage systems.
• Manage core enterprise services, including Active Directory, DNS, DHCP, Group Policy, NPS, and PKI.
• Oversee system monitoring, logging, patch management, backups, disaster recovery, and endpoint security.
• Lead complex troubleshooting efforts involving servers, virtualization, networking, authentication, and application performance.
• Manage vulnerability remediation, IAVAs, STIG compliance, security scanning, and patching in accordance with DoD requirements.
• Work with cybersecurity teams to implement security controls, address findings, and support RMF and ATO activities.
• Develop and maintain technical documentation, SOPs, system configurations, network diagrams, and recovery procedures.
• Lead system integration, testing, and deployment activities to meet operational and cybersecurity requirements.
• Mentor junior personnel, review configurations, and provide technical guidance.
• Collaborate with engineering, cybersecurity, networking, and program teams to resolve technical issues and meet project milestones.
• Identify and recommend improvements to system performance, reliability, security, and infrastructure efficiency.
• Monitor system health, manage outages, identify technical risks, and communicate status to program leadership.
• Support technical design reviews, trade studies, system testing, and configuration management activities.
• Ensure system changes follow approved change control, documentation, testing, and security review processes.
• Independently manage complex technical tasks, make informed decisions, and lead infrastructure efforts with minimal supervision.

Basic Qualifications:

Clearance Required: Must be eligible for TS/SCI. Minimum Secret to start.

• Bachelor's degree in IT, Computer Science, Engineering, or a related field with 12+ years of relevant experience. Additional experience may substitute for a degree.
• Minimum of 7 years of Windows systems administration experience, including 3 years in a senior or technical lead role.
• Minimum of 5 years of experience with Active Directory, DNS, Group Policy, and core Windows enterprise services.
• Active Top Secret/SCI security clearance or current Secret security clearance with the ability to obtain a TS/SCI security clearance within 365 days from hire date.
• Strong experience with Microsoft Hyper-V, virtual machines, clustering, storage, and Windows Server 2022/2025.
• Working knowledge networking, including TCP/IP, VLANs, routing, and firewalls.
• Experience with PowerShell scripting, automation, and Windows command-line tools.
• Experience supporting monitoring, logging, patch management, backup, and disaster recovery solutions.
• Hands-on experience with vulnerability scanning, IAVA remediation, STIG compliance, and system hardening.
• Working knowledge of DoD cybersecurity requirements, including NIST SP 800-53, RMF, and security configuration standards.
• Ability to troubleshoot complex infrastructure issues, support system integration, and maintain technical documentation and SOPs.
• Demonstrated ability to lead technical efforts, mentor junior administrators, work across engineering teams, and independently resolve technical challenges.
• Experience following configuration management, change control, and system maintenance processes.
• Strong communication, organizational, and problem-solving skills.
• Must meet applicable DoD 8140 certification and qualification requirements for the assigned work role.

Preferred Quals:

• Experience supporting DoD integration and testing environments.
• Active Top Secret/SCI security clearance.
• Hands-on experience with Windows Server 2025, Hyper-V high-availability clustering, and enterprise storage solutions.
• Experience with data center installations, including rack-and-stack, cabling, power, and out-of-band management.
• Experience integrating Windows and Linux systems with Cisco networking, firewalls, and secure remote access.
• Experience supporting Factory Acceptance Testing (FAT), System Acceptance Testing (SAT), and technical design reviews.
• Experience leading infrastructure deployments, developing installation procedures, and improving system administration processes.

Please be advised that during the interview, you will be required to keep your camera on, and your interviewer will be taking your picture for identification purposes if an offer letter is extended to you.

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.

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 the 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.