Systems Administrator

The Digital Modernization Sector within Leidos is seeking a System Administrator to support the GIG Service Management - Operations II

(GSM-O II) program in San Antonio, TX.

We're seeking a candidate experienced and proficient with Windows server or Linux server operations, sustainment, and management activities to help ensure secure, reliable, and uninterrupted availability of the DoD's secure mobile device capability service. As a Sys Admin, you'll work as part of a 24x7 Network Operations team responsible for managing an infrastructure comprised of a variety of servers, network appliances, and applications supporting voice and data services.

If this sounds like the kind of environment where you can thrive, keep reading!

Position will be on second shift, Monday thru Friday from 2pm-10pm.

Primary Responsibilities:

• Responsible for the maintenance, configuration, and reliable operation of computer systems, network servers, and virtualization.
• Install and upgrade computer components and software, manage virtual servers, and integrate automation processes.
• Troubleshoot hardware and software errors by running diagnostics, documenting problems and resolutions, prioritizing problems, and assessing impact of issues and escalating application problems to vendor, as necessary.
• Maintain essential IT infrastructure, including operating systems, security tools, applications, servers, email systems, laptops, desktops, software, and hardware.
• Perform server administration tasks (ex: user/group, security permissions, group policies); research event-log warnings and errors; and monitor resources to ensure that systems architecturecomponents work together seamlessly.
• Monitor device health using existing management tools, and respond to hardware issues as they arise; help build, test, and maintain new servers when needed.
• Maintain internal infrastructure requirements, including laptop and desktop computers, servers, routers, switches, firewalls, phones, security updates; support internet, intranet, LANs, WANs, and network segments.
• Assist with troubleshooting to identify root cause, and provide technical support when needed.
• Perform routine and scheduled audits of all systems, including backups.
• Implements Windows based security, including but not limited to: user / group permissions, file / folder permissions, group policies, local security policies, etc.
• Provides technical support for new system validations and change management efforts.
• Install and configure local area networks (LANs), wide area networks (WANs), and network segments and servers, such as file servers, VPN gateways, and intrusion detection systems.
• Manage user accounts, credentials, permissions, access rights, storage allocations, and active directory administration.
• Interacting with customers and senior managers, globally to handle service inquiries and problems.
• Coordinate with customers and stakeholders to collect data, conduct analysis, develop, and implement solutions associated with incident tickets and requirements.
• Provide follow-up reports (technical findings, feedback, resolution steps taken) for root cause analysis, engineering technical assessment and process improvement initiatives.
• Mentor junior team members.
• Update operations and maintenance documentation for 24/7/365 personnel.
• Support operations across multiple geographic locations.

Clearance:

• US Citizenship is required.
• An active Secret clearance is required for this position.

Basic Qualifications:

• The candidate must have a BS and 4+ years of prior relevant experience or Master with 2+ years of prior relevant experience.
• Candidate must, at a minimum, meet DoD 8570.11- IAT Level II certification requirements (currently Security+ CE, CCNASecurity,
• GSEC, or SSCP).
• Strong knowledge of systems and networking software, hardware, and networking protocols.
• Working knowledge of virtualization, VMWare, or equivalent.
• Expert knowledge of security, storage, data protection, and disaster recovery protocols.
• Experience with or knowledge of programming languages and operating systems, current equipment and technologies, enterprise backup and recovery procedures, systems performance-monitoring tools, active directories, virtualization, HTTP.
• Excellent customer service skills complimented by an ability to listen to and interpret client requests.
• Experience in multiple OS platforms with strong emphasis on Linux (CentOS, Red Hat, Ubuntu), Mac OS X and Windows
• systems.
• In-depth knowledge of the TCP / IP protocol suite, security architecture, securing and hardening Operating Systems,
• Networks, Databases and Applications.
• Experience with Tier 2 system administration.
• Experience with Scripting/Automation.
• Experience with server patch management methodologies Strong oral and written communications skills.
• Track record of working effectively within a team, and support to peers toward improved processes and results.
• Experience with support ticket management systems.

Desired Skills/Qualifications

• Experience operating/maintaining NMS systems to include operation, daily maintenance and capability enhancement.
• RHCSA (Red Hat Certified System Administrator) or RHCE (Red Hat Certified Engineer).
• Advanced CLI troubleshooting, RHEL Linux environments, systemd configuration, package management, kernel parameter tuning, firewall management (firewalld/iptables).
• Advanced Bash/Python scripting for automation.
• Deployment and scaling of OpenNMS (Meridian/Horizon).
• Configuring data collection (SNMPv3, WMI, JMX)
• Setting up distributed monitoring using OpenNMS Minions, Kafka integration, and managing thresholds/alarms.

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.

Original Posting:

June 16, 2026

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 $73,450.00 - $132,775.00

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.