Systems Administrator
Company: Leidos
Location: San Antonio
Posted on: April 3, 2026
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Job Description:
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! 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. 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: March 22, 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.
Keywords: Leidos, New Braunfels , Systems Administrator, IT / Software / Systems , San Antonio, Texas
