System Administrator

Leidos; United States; Hybrid; USD 116,000 - 210,000; Full time

Job summary

Leidos is seeking a Senior Windows System Administrator to join our high-performing team. The role requires a minimum Secret clearance to start, with eligibility for TS/SCI, and involves hybrid work with travel to Warner Robins AFB in GA.

The candidate will monitor and administer a mixed Windows/Linux environment, lead design and implementation, and drive security compliance across the enterprise IT infrastructure.

Qualifications

• Bachelor's degree in IT, Computer Science, Engineering, or a related field.
• 7+ years of Windows systems administration experience, including senior/lead role.
• 5+ years with core Windows services (AD, DNS, GP).
• Active Top Secret/SCI clearance or ability to obtain TS/SCI.
• Experience with Hyper-V, virtualization, clustering, storage, Windows Server 2022/2025.

Responsibilities

• Monitor and administer systems, applications, and processes to identify and resolve issues.
• Support servers, security management, and performance optimization in a Windows/Linux environment.
• Lead design, implementation, maintenance, and support of enterprise IT infra.
• Manage AD, DNS, GP, NPS, and PKI; oversee backups and disaster recovery.
• Lead troubleshooting, vulnerability remediation, and RMF/DoD security efforts.

Skills

Windows administration

Active Directory

DNS

Group Policy

PowerShell

Hyper-V

VMs

Security

Education

Bachelor's degree in IT / Computer Science / Engineering

Tools

Windows Server

Hyper-V

NPS / PKI

RMF / DoD 8140

Job 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 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.