Windows Server Administrator - Active Security Clearance Required

We’re looking for a Windows Systems Administrator to provide advanced technical computer, infrastructure, and operations support for enterprise Windows systems and related services. You will work in a safety-conscious, challenging, rapidly changing, and team-oriented environment to solve complex technical problems in a timely manner. This position is in the Information Technology Operations, ITO, Division within the Computing Directorate.

This position requires full-time on-site presence due to the nature of the work.

This position will be filled at eitherlevel based on knowledge and related experience as assessed by the hiring team. Additional job responsibilities (outlined below) will be assigned if hired at the higher level.

You will

• Perform advanced troubleshooting and administration for Windows Server, Active Directory, DNS, Group Policy, authentication, and related system integrations.
• Install, configure, maintain, patch, harden, and secure Windows servers and supporting infrastructure services.
• Administer enterprise backup systems, including job monitoring, failure remediation, restore operations, retention management, and recovery validation.
• Analyze complex incidents, identify root causes, implement corrective actions, and document resolutions.
• Develop and maintain PowerShell scripts and utilities to automate administration, monitoring, reporting, and support processes.
• Support cybersecurity operations, including account management, access controls, vulnerability remediation, system monitoring, compliance activities, and preparation of technical artifacts for Assessment and Authorization and ATO activities.
• Provide technical guidance and escalation support to Tier 1 and Tier 2 staff, and maintain accurate SOPs, knowledge articles, and system documentation.
• Participate in infrastructure upgrades, migrations, disaster-recovery and business-continuity exercises, datacenter operations, and operational improvement projects across Corporate and Isolated Networks.
• Perform other duties as assigned.

Additional job responsibilities, at the 393.2 level

• Diagnose, troubleshoot, and resolve highly complex Windows, system, network, backup, and integration problems, including driving problem resolution, working with vendors, and managing support cases as required.
• Serve as a technical leader and internal and external consultant, providing highly advanced technical assistance to the user community and collaborating with customers in the design and implementation of computing environments.
• Provide technical leadership for complex upgrades, migrations, disaster-recovery activities, cybersecurity remediation, and operational improvement projects.
• Mentor Tier 1 and Tier 2 staff and provide guidance on troubleshooting methods, system administration practices, and technical procedures.
• Lead root-cause investigations and develop corrective actions for recurring or highly complex incidents.
• Support the development, review, and maintenance of technical artifacts and evidence for ATO packages and other compliance activities.

• Active DOE Q clearance (or active Top Secret clearance) with the ability to obtain and maintain Sensitive Compartmented Information (SCI) access.
• Bachelor’s degree in a computer-related field, or an equivalent combination of education, technical training, and experience.
• Substantial experience administering Windows Server environments, including Active Directory, DNS, Group Policy, and related infrastructure.
• Extensive experience troubleshooting complex Windows infrastructure and enterprise services, or equivalent senior support role.
• Experience installing, configuring, maintaining, patching, Windows servers and supporting services.
• Ability to independently prioritize work, manage multiple assignments, and resolve complex technical problems.
• Strong interpersonal, verbal, and written communication skills, with the ability to work independently and collaborate with multidisciplinary teams.
• Ability to independently set priorities, manage multiple assignments, and resolve complex problems in a fast-paced environment.
• </insert>, * Highly advanced knowledge of and substantial experience with Windows Server, Active Directory, DNS, Group Policy, authentication, and related infrastructure.
• Substantial experience providing technical leadership, mentoring technical staff, and resolving complex infrastructure problems.
• Substantial experience developing or modifying PowerShell scripts and utilities for administration, monitoring, reporting, and process automation.
• Substantial experience leading system upgrades, migrations, disaster-recovery exercises, root-cause investigations, and corrective-action activities.

Qualifications We Desire

• Experience with cybersecurity tools, vulnerability remediation, access controls, security monitoring, and compliance activities.
• Experience administering enterprise backup and recovery platforms, including job monitoring, failure remediation, restore operations, retention management, and recovery validation.
• Experience with Windows hardening, security baselines, vulnerability remediation, access controls, and cybersecurity monitoring tools.
• Experience with enterprise management, patching, software distribution, virtualization, storage, and infrastructure-monitoring tools.
• Professional computer or network certification, such as Microsoft, CompTIA, Red Hat, or Cisco certifications.
• Experience supporting classified, regulated, isolated, or otherwise security-sensitive computing environments, including NIST-based security controls or comparable authorization activities.
• Experience serving as a technical team lead., This position requires an active Department of Energy (DOE) Q-level clearance or active Top Secret clearance issued by another U.S. government agency at time of hire. Also, you must have the ability to obtain and maintain Sensitive Compartmented Information (SCI) access. Please note that your current active Q or Top Secret clearance with DOE or another agency does not guarantee DOE SCI access approval; if you are denied access, you may be subject to reinvestigation of your existing Q or Top Secret Clearance.

$125,310 - $153,444 Yearly at the 393.1 level

$151,620 - $185,640 Yearly at the 393.2 level, * Included in 2026Best Places to Work by Glassdoor!

• FlexibleBenefits Package
• 401(k)
• Relocation Assistance
• Education Reimbursement Program
• Flexible schedules (*depending on project needs)
• Our values - visithttps://www.llnl.gov/inclusion/our-values

Join us and make YOUR mark on the World!

Lawrence Livermore National Laboratory (LLNL) has turned bold ideas into world-changing impact advancing science and technology to strengthen U.S. security and promote global stability.

Our mission spans four critical national security areas nuclear deterrence, threat preparedness, energy security, and multi-domain defense empowering teams to take on the toughest challenges of today and tomorrow. With a culture built on innovation and operational excellence, LLNL is a place where your expertise can make a real impact.