Senior Windows System Administrator - Infrastructure/Citrix

Leidos is a FORTUNE 500 company bringing a mix of innovative technology and sector expertise to customers in the national security, engineering, and the health industries. Leidos is seeking an Senior Windows System Administrator for a position as part of a team supporting the Unified Cyber Situational Awareness (UCSA) in Pensacola, FL. This is an onsite position, no full-time telework allowed.

Primary Responsibilities

• Lead efforts to build, install, configure, maintain, and troubleshoot computer workstations, servers, and IT-related peripherals (e.g., printers, scanners), ensuring optimal performance and uptime across the enterprise.
• Manage and maintain both physical and virtual Windows-based infrastructures, including domain controllers, DNS, file and print servers, and shared drives, ensuring high availability and scalability.
• Perform system administration functions such as Active Directory (AD) management, creation and enforcement of Group Policies, oversight of Certificate Revocation Lists (CRLs), and provisioning of user and service accounts.
• Evaluate and enhance system security posture by applying necessary configuration changes in compliance with organizational policies and higher authority directives.
• Utilize tools such as Group Policy Objects (GPOs), SCAP tools, and STIGs to ensure infrastructure security compliance and system hardening.
• Install, configure, and maintain software, firmware, and security patches for Windows 10/11 and Windows Server 2019/2022 environments, ensuring systems remain secure and up-to-date.
• Troubleshoot and resolve hardware and software issues using system error logs, diagnostic tools, and user-reported incidents to maintain system reliability and performance.
• Plan and lead the implementation of new IT hardware and software upgrades as part of infrastructure modernization and lifecycle support initiatives.
• Provide technical support to engineers during architecture design reviews and contribute to the planning and execution of technology refresh projects.
• Conduct regular server backups and restoration testing to ensure data integrity and disaster recovery preparedness.
• Monitor software licenses and PKI certificate status, coordinating timely renewals and installations to prevent disruptions in service.
• Perform technical analysis and root cause investigations, generating documentation such as Standard Operating Procedures (SOPs), technical reports, and process improvement recommendations.
• Mentor junior team members, promote knowledge-sharing, and help drive a culture of operational excellence and continuous improvement within the IT team.

Basic Qualifications

• Requires BS and 8+ years of prior relevant experience or Masters with 6+ years of prior relevant experience, additional years of experience will be accepted in lieu of a degree.
• Must have a DoD 8570 IAT Level I approved certification (CompTIA Security+).
• Solid understanding of network services and protocols within a Microsoft Windows environment, including DNS, firewalls, routers, ports, and protocols.
• Hands-on experience with Windows Server 2019 and 2022 administration, including expertise in Active Directory, DNS, Group Policy, workstation/server deployment, and end-user data migration.
• Working knowledge of cybersecurity best practices, including system hardening, patch management, and adherence to DoD or enterprise-level compliance standards.
• Familiarity with security tools and frameworks such as Security Content Automation Protocol (SCAP), Security Technical Implementation Guides (STIGs), and Information Assurance Vulnerability Management (IAVMs).
• General understanding of cryptographic principles, including symmetric/asymmetric encryption, secure hashing, and digital signatures.
• Strong interpersonal skills with the ability to maintain effective communication and collaborative relationships across technical and non-technical teams.
• Highly organized, detail-oriented, and dependable, with a proactive mindset and a commitment to quality and accuracy.
• Demonstrated troubleshooting and diagnostic skills, with the ability to resolve complex technical issues independently and efficiently.
• Must have an active Secret clearance and pass a drug test.

Preferred Qualifications

• Minimum of 1+ year experience with PowerShell Scripting
• Experience with certificate-enabled applications such as SSL/TLS, S/MIME, authentication, Encrypted File System, Code Signing, etc.
• Hands-on familiarity and experience with Axway Desktop Validator, 90Meter and HID ActivClient middleware applications
• Familiarity with or working knowledge of Citrix Virtual Apps and Desktops 2203/2204 LTSR components; Citrix Provisioning Services (PVS) architecture; Citrix Profile Manager; Workspace App and Citrix NetScaler environment or an equivalent combination of education and work experience.
• Ability to install and configure software, firmware, upgrades and security updates/patches to maintain and secure Windows 10/11, Server 2019/2022, Citrix and VMWare operating systems and associated hardware
• Build, install, configure, maintain and troubleshoot Citrix Virtual Apps and desktop farms, Citrix Hypervisors, Citrix FIPS NetScaler Gateway, VMware vSphere and VMware Horizon Virtual Desktops
• Identify and correct inefficiencies and implement optimizations to improve existing Windows and Citrix infrastructures, as needed.
• Monitor Citrix infrastructure and identify system alerts, before they impact customers, including storage availability/capacity, performance latency, network connectivity, database health, and other daily health checks, as required.
• VMware vCenter and VMware ESXi experience
• Virtualization, to include VMWare's entire vSphere Platform and Citrix Hypervisor
• Storage, to include VMWare vSAN and Citrix Pool
• VMWare Horizon Virtual Desktop Infrastructure (VDI)
• Familiarity with or working knowledge of Citrix Virtual Apps and Desktops (CVAD)
• Netscaler MPX, Citrix Application Delivery Controller / Load Balancing with End-to-End FIPS secured communications

Original Posting:
April 18, 2025
For U.S. Positions: While subject to change based on business needs, Leidos reasonably anticipates that this job requisition will remain open for at least 3 days with an anticipated close date of no earlier than 3 days after the original posting date as listed above.

Pay Range:
Pay Range $89,700.00 - $162,150.00

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.