Top 86 It systems administrator Jobs in San Antonio, Tx

Information Systems Security Officer (ISSO), Network Security, TS/SCI
Data Systems Analysts, Inc. —San Antonio, TX
- $120,000 - $160,000 a year
- Computer science
- Computer Science
- Bachelor of Science
Quick Apply
Linux Administrator
Govcio LLC —San Antonio, TX
- $125,000 - $135,000 a year
- Full-time
- Customer service
- High school diploma or GED
- In-person
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IT Systems Administrator
START Center for Cancer Research —San Antonio, TX
- Monday to Friday
- HIPAA
- Mid-level
- Clinic
- Health savings account
- Paid holidays
Quick Apply
8d
IT Administrator
AVANCE San Antonio Inc —San Antonio, TX
- Weekends as needed
- Spanish
- Clean driving record
- Microsoft Excel
IT Service Desk Specialist II
BRS —San Antonio, TX
- Full-time
- Mid-level
- Bachelor's degree
- Experience equivalent to degree accepted
- Profit sharing
- Paid holidays
System Administrator
The 20 —San Antonio, TX
- Computer Science
- Mid-level
- Windows
2d
System Administrator (Health IT System ADMIN)
BUSINESS ENABLED ACQUISITIONandTECHNOLOGY Inc —San Antonio, TX
- Full-time
- Computer Science
- Bachelor of Science
- SQL
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Systems Administrator
General Dynamics Information Technology —San Antonio, TX
- $64,230 - $73,866 a year
- Microsoft Access
- Microsoft Outlook
- Computer Science
- Paid holidays
- On-the-job training
IT SPECIALIST
School of Science & Technology —San Antonio, TX
- $21.50 - $34.11 an hour
- Weekends as needed
- Classroom
- Word processing
- Computer literacy
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Systems Administrator
Gonzaba Medical Group —San Antonio, TX
- Full-time
- Azure
- Computer Science
- Mid-level
- Mileage reimbursement
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Systems Administrator
Interclypse, Inc. —San Antonio, TX
- Azure
- Mid-level
- Paid jury duty
- Health savings account
IT Support Specialist
GFS Home Loans —San Antonio, TX
- $42,500 - $53,500 a year
- Full-time
- Microsoft Excel
- Microsoft Outlook
- Computer Science
- Paid holidays
- Health insurance
Quick Apply
13d
Systems Administrator II
IPSecure, Inc. —Lackland AFB, TX
- $80,000 - $100,000 a year
- Computer Science
- PMP
- Mid-level
- Paid holidays
- Health insurance
Quick Apply
System Administrator
SRC, Inc. —San Antonio, TX
- $110,000 - $127,000 a year
- Full-time
- Computer Science
- Mid-level
- Windows
- Paid time off
Senior System Administrator - UKG
University Health —San Antonio, TX
- $34.25 - $58.29 an hour
- Full-time
- Windows
- Analysis skills
- APIs
- Paid holidays
- Health insurance
IT SPECIALIST - SR. IT SPECIALIST - Microsoft Windows & VMWare Engineering
Southwest Research Institute —San Antonio, TX
- Azure
- 6 years
- Mid-level
Systems Administrator II
Alpha Omega Integration —San Antonio, TX
- $70,000 - $109,969 a year
- Computer Science
- Bachelor of Science
- Mid-level
- Health savings account
- Paid holidays
Quick Apply
System Administrator
SRC, Inc —San Antonio, TX
- $110,000 - $127,000 a year
- Holidays
- Computer Science
- Mid-level
- Windows
- Paid time off
Systems Engineer / System Administrator for Managed Service Provider
Straight Edge Technology, Inc. —San Antonio, TX
- $60,000 - $90,000 a year
- Full-time
- Azure
- Computer Science
- Customer service
- Paid parental leave
- Dental insurance
Quick Apply
LEAD IT ANALYST - SR. IT ANALYST - Oracle Database Administrator
Southwest Research Institute —San Antonio, TX
- Hybrid work
- Computer Science
- ERP systems
- High school diploma or GED

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Information Systems Security Officer (ISSO), Network Security, TS/SCI

Data Systems Analysts, Inc. -
San Antonio, TX

Quick Apply

Job Details

$120,000 - $160,000 a year

Qualifications

Authentication
Document compliance management
Vulnerability scanning implementation
CCNP
NIST SP 800-53
Technical documentation
Cisco Nexus
CCNA
IT system monitoring
Configuration management
Network infrastructure
Network configuration for security systems
DHCP
Network scanners
Computer hardware
DoD 8570
DNS
Vulnerability management
VPN management
IAT
CompTIA Security+
IAT Level II
Vuls
IT security monitoring

Full Job Description

All hired employees are expected to have experience with Microsoft Copilot and / or an approved equivalent AI solution.

Description

Data Systems Analysts, Inc. (DSA) is seeking a TS/SCI cleared Information System Security Officer (ISSO), Network Security to support enterprise network systems in a secure DoD environment. The Network ISSO will support cybersecurity compliance, Risk Management Framework (RMF), vulnerability management, DISA STIG validation, continuous monitoring, and authorization sustainment for Cisco based network infrastructure.

The Network ISSO will work closely with network engineers, cybersecurity staff, ISSMs, ISSEs, system owners, and mission partners to ensure network systems remain secure, compliant, documented, and operationally effective. This role is suited for a technical ISSO with experience in RMF, ACAS, eMASS, POA&Ms, firewall rule reviews, ports and protocols, vulnerability remediation, and secure network operations.

This position is onsite in Charlottesville, VA.

Responsibilities

Support cybersecurity compliance, risk management, and continuous monitoring for enterprise network systems.
Review and validate security configurations for Cisco routers, switches, firewalls, and related network infrastructure.
Support DISA STIG validation, SCAP benchmarks, security baselines, and device hardening requirements.
Conduct, review, and validate vulnerability scans using ACAS, Tenable Nessus, STIG Viewer, and other approved DoD tools.
Analyze vulnerability findings, identify false positives, document risk, and coordinate remediation with network engineering teams.
Develop and maintain RMF documentation including SSPs, POA&Ms, Continuous Monitoring artifacts, hardware and software inventories, network diagrams, and control implementation details.
Support ATO package development, renewal, extension, audit readiness, and authorization sustainment activities.
Review firewall rules, access control lists, ports, protocols, services, VPN connections, network flows, and boundary protection controls.
Support change control reviews by assessing network changes for cybersecurity, RMF, documentation, and compliance impacts.
Monitor compliance through eMASS, ACAS, STIG Viewer, vulnerability management tools, and other approved DoD systems.
Support incident response activities by reviewing network related alerts, logs, firewall events, syslog data, authentication events, and corrective actions.
Prepare security status updates, vulnerability summaries, POA&M updates, compliance reports, and risk briefings for stakeholders and leadership.

Required Education, Certifications and Security Clearance

BS degree in Engineering, Computer Science, or related field
- Experience may be substituted for degree.
TS/SCI Clearance
DoD 8140 (8570) IAT Level II Certification
CCNA certification

Requirements Experience/Qualifications

Minimum 4 years of experience supporting cybersecurity, information assurance, network security, RMF, vulnerability management, or secure infrastructure operations.
Experience supporting cybersecurity activities within the DoD, Intelligence Community, or other secure enterprise environment.
Demonstrated understanding of DoD cybersecurity policy, RMF lifecycle, continuous monitoring, and authorization sustainment.
Experience developing or maintaining SSPs, POA&Ms, Continuous Monitoring documentation, control implementation details, and authorization artifacts.
Familiarity with eMASS for control tracking, package updates, risk documentation, and authorization maintenance.
Hands on experience with ACAS, Tenable Nessus, STIG Viewer, SCAP, or vulnerability management processes.
Experience reviewing, validating, or remediating vulnerability findings for network devices or supporting infrastructure.
Experience applying or validating DISA STIGs, secure configuration baselines, and hardening guidance.
Working knowledge of Cisco routers, switches, firewalls, Cisco ASA, Cisco Firepower, Cisco Secure Firewall, Cisco ISE, Catalyst, Nexus, ISR, or ASR platforms.
Working knowledge of routing, switching, VLANs, ACLs, firewall policies, ports, protocols, VPNs, IPsec, NAT, DNS, DHCP, subnetting, logging, and boundary protection.
Ability to review network diagrams, firewall rule sets, data flows, ports and protocols, and system interconnections for security and compliance impacts.
Experience coordinating with network engineers, system administrators, ISSMs, ISSEs, system owners, and mission partners to resolve security findings.
Knowledge of NIST SP 800-37, NIST SP 800-53, CNSSI 1253, DISA STIGs, DoD cybersecurity policy, and Intelligence Community cybersecurity requirements.
Strong documentation, communication, analytical, and coordination skills.

Preferred Experience/Qualifications

CCNP, CCNP Security, Cisco CyberOps, or equivalent network security certification.
CISSP, CISM, CGRC, CAP, CASP+, SecurityX, CySA+, CEH, PenTest+, or equivalent cybersecurity certification.
Experience supporting DoD or Intelligence Community network environments.
Experience securing, assessing, or documenting Cisco ASA, Cisco Firepower, Cisco Secure Firewall, Cisco ISE, Catalyst, Nexus, ISR, or ASR platforms.
Experience reviewing firewall rules, access control policies, route tables, network diagrams, ports and protocols, VPNs, boundary security, or system interconnection documentation.
Familiarity with Zero Trust principles, network segmentation, identity based access control, and modern DoD cybersecurity architecture.
Experience with Splunk, Elastic, ELK Stack, OpenSearch, SolarWinds, Wireshark, NetFlow, syslog, firewall logs, or other tools used to support monitoring and incident response.
Familiarity with network automation or scripting tools such as Ansible, Python, PowerShell, Terraform, or Cisco Catalyst Center.
Knowledge of continuous authorization, continuous monitoring, governance, risk management, and compliance sustainment.

Applicable Military Backgrounds

Army: 17C, 25B, 25D, 25H, 255A, 255N, 255S
Navy: IT, ITS, ITN, ITR, CWT, 1820, 1880
Air Force: 1B4X1, 1D7X1, 1D7X1A, 1D7X5, 17D, 17S
Marine Corps: 0631, 0671, 0681, 1702, 1721
Space Force: 5C0X1, 17X
Coast Guard: IT, CMS, CMM, C5I

#DSA209

#LI-KE1

Many of DSA's positions require the ability to obtain a security clearance. Security clearances may only be granted to U.S. citizens. In addition, applicants who accept a conditional offer of employment may be subject to government security investigation(s) and must meet eligibility requirements for access to classified information. DSA is proud to be an Equal Opportunity Employer. DSA is committed to treating all employees and applicants for employment with respect and dignity and maintaining a workplace that is free from unlawful discrimination. All qualified applicants will receive consideration for employment without regard to race, color, sex, sexual orientation, gender identity, religion, national origin, disability, veteran status, or other legally protected status. DSA requires background checks , where permitted , by law. DSA is an E-Verify Employer.

Quick Apply

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it systems administrator jobs in san antonio, tx

Information Systems Security Officer (ISSO), Network Security, TS/SCI

Linux Administrator

IT Systems Administrator

IT Administrator

IT Service Desk Specialist II

System Administrator

System Administrator (Health IT System ADMIN)

Systems Administrator

IT SPECIALIST

Systems Administrator

Systems Administrator

IT Support Specialist

Systems Administrator II

System Administrator

Senior System Administrator - UKG

IT SPECIALIST - SR. IT SPECIALIST - Microsoft Windows & VMWare Engineering

Systems Administrator II

System Administrator

Systems Engineer / System Administrator for Managed Service Provider

LEAD IT ANALYST - SR. IT ANALYST - Oracle Database Administrator

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