System Administrator Jobs in San Antonio, TX
System Administrator jobs in San Antonio are concentrated in the medical center corridor, downtown, and the northwest technology belt near USAA and Lackland Air Force Base, with strong demand across defense contracting, healthcare, and financial services. Employers hiring right now include University Health, RealmOne, and XPEL. See the openings below and apply to the ones that match your experience.
Find System Administrator JobsOverview
Showing 5 of 64+ System Administrator jobs
The RealmOne TRIBE is looking for you!
RealmOne was built on the principle that people matter first and foremost. We believe in providing a strong work/life balance by investing in our employees and encouraging professional and personal growth. We do this by offering exceptional benefits, flexible schedules, and the tools necessary to achieve success through paid training, mentoring, and the opportunity to work alongside top-notch industry professionals.
Join us on this journey as we execute this mission-critical contract providing systems architecture and engineering in a world-wide multi-level Enterprise IT environment!
Your effort and expertise are crucial to the success and execution of this impactful mission. This opportunity supports an Enterprise IT contract with a team of SIGDEV Analysts, Systems Engineers, Junior Engineers, Telecommunication Technical Analysts and System Administrators, responsible for the architecture, engineering, integration, operations, maintenance and sustainment of multi-level Enterprise IT environment.
Job Description:
We are looking for a dedicated Systems Administrator who provides support for implementation, troubleshooting and maintenance of Information Technology (IT) systems. Manages IT system infrastructure and any processes related to these systems. Provides support to IT systems including day-to-day operations, monitoring and problem resolution for all of the client/server/storage/network devices, mobile devices, etc. Provides Tier 1 (Help Desk) and Tier 2 (Escalation) problem identification, diagnosis and resolution of problems. Provides support for the escalation and communication of status to agency management and internal customers. Provides support for the dispatch system and hardware problems and remains involved in the resolution process. Configures and manages UNIX and Windows operating systems and installs/loads operating system software, troubleshoots, maintains integrity and configures network components along with implementing operating systems enhancements to improve reliability and performance.
The System Administrator LCAT 3 shall possess the following capabilities:
- Provide support for implementation, troubleshooting and maintenance of IT systems.
- Provide Tier 1 (Help Desk) and Tier 2 (Escalation) problem identification, diagnosis and resolution of problems.
- Manage the daily activities of configuration and operation of IT systems.
- Provide assistance to users in accessing and using IT systems.
- Provide support to IT systems including day-to-day operations, monitoring and problem resolution for all of the client/server/storage/network devices, mobile devices, etc.
- Provide support for the escalation and communication of status to agency management and internal customers.
- Optimize system operations and resource utilization and perform system capacity analysis and planning.
- Provide in-depth experience in trouble-shooting IT systems.
- Provide detailed analysis and feedback to agency management and internal customers for escalated tickets.
- Configure and manage UNIX and Windows (or other applicable) operating systems and installs/loads operating system software, troubleshoot, maintain integrity of and configure network components, along with implementing operating systems enhancements to improve reliability and performance.
- Support the design of systems, mission architecture and associated hardware.
- Possess a working knowledge and understanding of system administration interdependencies as part of the Service Oriented Architecture (SOA).
- Analyze and resolve complex problems associated with server hardware, applications and software integration.
Qualifications:
Level 3:
- Fifteen (15) years’ experience as an SA in programs and contracts of similar scope, type and complexity is required.
- Five (5) years of additional SA experience may be substituted for a bachelor’s degree.
- Bachelor’s degree in a technical discipline from an accredited college or university is required.
- CWIP Certification Compliance with IAT Level III is required.
Position requires active Security Clearance with appropriate Polygraph
Pay Range: Competitive
The RealmOne pay range for this job level is a general guideline only and not a guarantee of compensation or salary. Our approach to crafting offers considers various factors to establish an equitable and competitive compensation package. These considerations include, but are not limited to, the extent and intricacy of the role’s responsibilities, the candidate’s educational background, their work experience, and the specific competencies crucial for success in the role.
RealmOne Benefits:
- Healthcare Coverage + Insurance: Medical: Three (3) rich healthcare options through CareFirst with 100% or majority company-paid premiums. Tax-advantaged health savings account available with generous employer contribution. Dental + Vision: 100% employer-paid for employees and family, with a buy-up option available.
- Retirement + Savings: 401K – 10% TOTAL CONTRIBUTION – 5% safe harbor – 5% annual profit share (both immediately vested!).
- Paid Time Off + More: 4 weeks starting PTO – 11 federal holidays + 2 floating holidays – Paid hours for company-required training.
- Career Growth + Development: Access to FREE 24/7 learning via Udemy – Opportunities to participate in tech councils, industry initiatives, etc. – $7,500 annual Educational & Professional Development Assistance.
- MORE BENEFITS…FOR EVERY LIFESTYLE! – Paid parental leave – Annual swag drops – Flexible work schedules -Generous referral bonus program – Employee appreciation + family-friendly corporate events …and much more.
ABOUT US
- RealmOne is a mid-sized science and technology company dedicated to solving our customers’ toughest mission challenges.
- Headquartered in Columbia, MD., RealmOne supplies advanced cybersecurity, data science, and software engineering services and products to customers in the Government and commercial sectors.
- RealmOne delivers encompassing mission assurance and critical systems support to government customers across various U.S. locations to include Colorado, Georgia, Hawaii, Texas, Utah, and Virginia.
- RealmOne has won numerous awards, including Top Workplaces by the Baltimore Sun. Across more than 20 prime contracts, RealmOne is a premier innovator for the Government and Department of Defense, and our team is located across the United States.
The RealmOne TRIBE is looking for you!
RealmOne was built on the principle that people matter first and foremost. We believe in providing a strong work/life balance by investing in our employees and encouraging professional and personal growth. We do this by offering exceptional benefits, flexible schedules, and the tools necessary to achieve success through paid training, mentoring, and the opportunity to work alongside top-notch industry professionals.
Join us on this journey as we execute this mission-critical contract providing systems architecture and engineering in a world-wide multi-level Enterprise IT environment!
Your effort and expertise are crucial to the success and execution of this impactful mission. This opportunity supports an Enterprise IT contract with a team of SIGDEV Analysts, Systems Engineers, Junior Engineers, Telecommunication Technical Analysts and System Administrators, responsible for the architecture, engineering, integration, operations, maintenance and sustainment of multi-level Enterprise IT environment.
Job Description:
We are looking for a dedicated Systems Administrator who provides support for implementation, troubleshooting and maintenance of Information Technology (IT) systems. Manages IT system infrastructure and any processes related to these systems. Provides support to IT systems including day-to-day operations, monitoring and problem resolution for all of the client/server/storage/network devices, mobile devices, etc. Provides Tier 1 (Help Desk) and Tier 2 (Escalation) problem identification, diagnosis and resolution of problems. Provides support for the escalation and communication of status to agency management and internal customers. Provides support for the dispatch system and hardware problems and remains involved in the resolution process. Configures and manages UNIX and Windows operating systems and installs/loads operating system software, troubleshoots, maintains integrity and configures network components along with implementing operating systems enhancements to improve reliability and performance.
The System Administrator LCAT 3 shall possess the following capabilities:
- Provide support for implementation, troubleshooting and maintenance of IT systems.
- Provide Tier 1 (Help Desk) and Tier 2 (Escalation) problem identification, diagnosis and resolution of problems.
- Manage the daily activities of configuration and operation of IT systems.
- Provide assistance to users in accessing and using IT systems.
- Provide support to IT systems including day-to-day operations, monitoring and problem resolution for all of the client/server/storage/network devices, mobile devices, etc.
- Provide support for the escalation and communication of status to agency management and internal customers.
- Optimize system operations and resource utilization and perform system capacity analysis and planning.
- Provide in-depth experience in trouble-shooting IT systems.
- Provide detailed analysis and feedback to agency management and internal customers for escalated tickets.
- Configure and manage UNIX and Windows (or other applicable) operating systems and installs/loads operating system software, troubleshoot, maintain integrity of and configure network components, along with implementing operating systems enhancements to improve reliability and performance.
- Support the design of systems, mission architecture and associated hardware.
- Possess a working knowledge and understanding of system administration interdependencies as part of the Service Oriented Architecture (SOA).
- Analyze and resolve complex problems associated with server hardware, applications and software integration.
Qualifications:
Level 3:
- Fifteen (15) years’ experience as an SA in programs and contracts of similar scope, type and complexity is required.
- Five (5) years of additional SA experience may be substituted for a bachelor’s degree.
- Bachelor’s degree in a technical discipline from an accredited college or university is required.
- CWIP Certification Compliance with IAT Level III is required.
Position requires active Security Clearance with appropriate Polygraph
Pay Range: Competitive
The RealmOne pay range for this job level is a general guideline only and not a guarantee of compensation or salary. Our approach to crafting offers considers various factors to establish an equitable and competitive compensation package. These considerations include, but are not limited to, the extent and intricacy of the role’s responsibilities, the candidate’s educational background, their work experience, and the specific competencies crucial for success in the role.
RealmOne Benefits:
- Healthcare Coverage + Insurance: Medical: Three (3) rich healthcare options through CareFirst with 100% or majority company-paid premiums. Tax-advantaged health savings account available with generous employer contribution. Dental + Vision: 100% employer-paid for employees and family, with a buy-up option available.
- Retirement + Savings: 401K – 10% TOTAL CONTRIBUTION – 5% safe harbor – 5% annual profit share (both immediately vested!).
- Paid Time Off + More: 4 weeks starting PTO – 11 federal holidays + 2 floating holidays – Paid hours for company-required training.
- Career Growth + Development: Access to FREE 24/7 learning via Udemy – Opportunities to participate in tech councils, industry initiatives, etc. – $7,500 annual Educational & Professional Development Assistance.
- MORE BENEFITS…FOR EVERY LIFESTYLE! – Paid parental leave – Annual swag drops – Flexible work schedules -Generous referral bonus program – Employee appreciation + family-friendly corporate events …and much more.
ABOUT US
- RealmOne is a mid-sized science and technology company dedicated to solving our customers’ toughest mission challenges.
- Headquartered in Columbia, MD., RealmOne supplies advanced cybersecurity, data science, and software engineering services and products to customers in the Government and commercial sectors.
- RealmOne delivers encompassing mission assurance and critical systems support to government customers across various U.S. locations to include Colorado, Georgia, Hawaii, Texas, Utah, and Virginia.
- RealmOne has won numerous awards, including Top Workplaces by the Baltimore Sun. Across more than 20 prime contracts, RealmOne is a premier innovator for the Government and Department of Defense, and our team is located across the United States.
See All 64 System Administrator Jobs in San Antonio
Find roles in San Antonio that match your experience and apply in just a few clicks.
Find System Administrator JobsSystem Administrator Job Market in San Antonio
Who's Hiring
- University Health19
- RealmOne13
- XPEL6
- Empower AI6
- Brundage Management6
System Administrator Jobs in San Antonio: Frequently Asked Questions
How do I get a system administrator job in San Antonio?
Focus on San Antonio's largest hiring sectors: defense and federal contracting around Lackland Air Force Base and Port San Antonio, the South Texas Medical Center complex, and financial services firms concentrated downtown and in the northwest suburbs. Candidates with active security clearances, experience supporting government or healthcare environments, and certifications like CompTIA Security+ or Microsoft Certified: Azure Administrator move to the front of the line in this market.
Which companies hire system administrators in San Antonio?
Companies currently hiring system administrators in San Antonio include University Health, RealmOne, and XPEL, per current listings on Migrate Mate as of September 2026. San Antonio's employer mix skews toward large defense contractors, regional health systems, and financial institutions, many of which maintain significant on-site IT infrastructure requiring dedicated systems staff.
Are there remote system administrator jobs in San Antonio?
Yes, though with limits: system administrator roles tied to physical servers, data centers, or government-classified environments are predominantly on-site, while cloud-focused or monitoring-heavy positions lean more remote. About 0% of system administrator openings tied to San Antonio are remote or hybrid as of September 2026. Cloud infrastructure and help desk escalation roles offer the strongest remote options locally.
How can I get a system administrator job in San Antonio with little or no experience?
The most realistic entry path in San Antonio is through helpdesk or IT support roles at the city's large health systems, such as those in the South Texas Medical Center, or with defense contractors that hire entry-level technicians for base IT operations. Earning a CompTIA A+ or Network+ certification before applying, and targeting junior roles with federal subcontractors at Port San Antonio, gives candidates without a long work history a concrete foothold in the local market.
See All 64 System Administrator Jobs in San Antonio
Find roles in San Antonio that match your experience and apply in just a few clicks.
Find System Administrator Jobs