Senior Windows System Administrator

Leidos is seeking a Senior Windows System Administrator to join its high-performing team in support of a complex, fast-paced program. The successful 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 and engineering assistance
• Deploying and sustaining new capabilities within the environment
• Monitoring and administering systems, applications, and processes to ensure issues are identified, tracked, and resolved in a timely manner
• Supporting servers and performing security management and application performance optimization activities

Additional responsibilities include:

• Serving as a senior technical SME responsible for designing, implementing, maintaining, and supporting enterprise IT infrastructure
• Leading the installation, administration, and troubleshooting of Windows Server, Linux, Hyper-V clusters, virtual machines, and storage systems
• Managing core enterprise services, including Active Directory, DNS, DHCP, Group Policy, NPS, and PKI
• Overseeing system monitoring, logging, patch management, backups, disaster recovery, and endpoint security
• Leading complex troubleshooting efforts involving servers, virtualization, networking, authentication, and application performance
• Managing vulnerability remediation, IAVAs, STIG compliance, security scanning, and patching in accordance with DoD requirements
• Working with cybersecurity teams to implement security controls, address findings, and support RMF and ATO activities
• Developing and maintaining technical documentation, SOPs, system configurations, network diagrams, and recovery procedures
• Leading system integration, testing, and deployment activities to meet operational and cybersecurity requirements
• Mentoring junior personnel, reviewing configurations, and providing technical guidance
• Collaborating with engineering, cybersecurity, networking, and program teams to resolve technical issues and meet project milestones
• Identifying and recommending improvements to system performance, reliability, security, and infrastructure efficiency
• Monitoring system health, managing outages, identifying technical risks, and communicating status to program leadership
• Supporting technical design reviews, trade studies, system testing, and configuration management activities
• Ensuring system changes follow approved change control, documentation, testing, and security review processes
• Independently managing complex technical tasks, making informed decisions, and leading infrastructure efforts with minimal supervision

Leidos offers 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.

Requirements:

• Bachelor's degree in IT, Computer Science, Engineering, or a related field with 12+ years of relevant experience
• 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 of 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