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.
GSMO
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:May 19, 2026For 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.
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.
Skills Required
- BS and 4+ years of prior relevant experience or Master with 2+ years of prior relevant experience
- Meet DoD 8570.11- IAT Level II certification requirements (Security+ CE, CCNA Security, 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
- In-depth knowledge of TCP/IP protocol suite, security architecture, operating systems, and networks
Leidos Compensation & Benefits Highlights
The following summarizes recurring compensation and benefits themes identified from responses generated by popular LLMs to common candidate questions about Leidos and has not been reviewed or approved by Leidos.
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Healthcare Strength — Healthcare coverage is described as comprehensive, with multiple plan options, low office-visit copays in some plans, and access to mental health and wellness support tools. The availability of HSA/FSA options and employer contributions is positioned as a meaningful part of the total package.
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Retirement Support — Retirement benefits are framed as a strong component of total rewards, highlighted by a 401(k) match and immediate vesting in the standard package. The Employee Stock Purchase Plan is also presented as an additional long-term wealth-building feature.
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Wellbeing & Lifestyle Benefits — Wellbeing and lifestyle supports extend beyond core insurance, including wellness programs, fitness-related stipends, and assistance resources. Work flexibility and related perks are also included as part of the broader rewards experience.
Leidos Insights
What We Do
We Are Leidos For 50 years we have been tackling some of the biggest problems that face our nation and our world. OUR MISSION Through our culture of innovation and history of performance, we develop deep customer trust built on integrity and create enduring solutions that improve our world. Leidos is a science and technology solutions leader working to address some of the world’s toughest challenges in the defense, intelligence, homeland security, civil, and healthcare markets. The company’s 43,000 employees support vital missions for government and commercial customers. Headquartered in Reston, Va., Leidos reported annual revenues of approximately $11.09 billion for the fiscal year ended January 3, 2020. Leidos was cited for the meaningful work employees perform that is challenging, impactful, and aligned with our customers’ missions as reasons professionals want to work and stay at our company. Leidos has also been named to lists including Forbes’ Best Employers for Diversity, Forbes’ America’s Best Employers for Women, Military Times Best for Vets Employers, and Ethisphere Institute’s World's Most Ethical Companies®. Employees enjoy career enrichment opportunities available through mobility and development and experience rewarding relationships with supportive supervisors and talented colleagues and customers. Employees appreciate our flexible work environment, allowing for and encouraging a true work-life balance. Our professionals are also excited about our Employee Resource Groups, like the newly launched Collaborative Outreach with Remote and Embedded Employees (CORE), which strives to create an environment where every employee, regardless of location, feels fully engaged as a valued employee of Leidos. Your most important work is ahead.
