Systems Administrator – Senior Site Support Specialist

Jobtailor; San Antonio (TX); On-site; USD 70,000 - 100,000; Full time

Job summary

Jobtailor is seeking a skilled IT specialist to support the DoD Mobility Classified Capability (DMCC) program. You will manage Tier-III HelpDesk tasks, troubleshoot complex issues, and perform secure configuration across Windows and Linux servers and network devices.

The role requires DoD Secret clearance, DoD-8570 IAT Level II (Security+ CE), and after-hours onsite callback availability. A bachelor’s or master’s degree with related experience is expected, in addition to VPN and network

Qualifications

• Bachelor’s or Master’s degree with related experience; additional experience may be considered in lieu of degree.
• Active DoD Secret clearance or higher required prior to start.
• DoD-8570 IAT Level II Certification (Security+ CE) required within 6 months of hire.
• Experience with Windows Server, Active Directory, and DNS.
• Experience with Linux (RHEL 8 or 9).
• Experience with cybersecurity tools and scanning (ACAS, Tenable, or Ansible).
• Experience troubleshooting software applications, networking, Windows OS, and Linux OS issues.
• Experience performing system administration tasks including installing, maintaining, monitoring, recovering, rebuilding, upgrading, and patching.

Responsibilities

• Support the DISA NetOps / Tier-III HelpDesk for the DMCC program.
• Troubleshoot complex problems and perform software configuration.
• Monitor and maintain Windows and Linux servers and network appliances.
• Assist with VPN connectivity debugging and device management.
• Perform system maintenance and patching to secure environments.
• Provide after-hours onsite callback support when required.

Skills

Windows Server

Linux (RHEL 8/9)

Active Directory

DNS

Cybersecurity Tools

Networking

Troubleshooting

Documentation

VPN Connectivity Debugging

Education

Bachelor’s degree or Master’s in a related field

Tools

ACAS

Tenable

Ansible

Cisco

Aruba

Juniper

Job description

• Support the DISA NetOps / Tier-III HelpDesk for the DoD Mobility Classified Capability (DMCC) program under GSM-O II
• Handle service inquiries, troubleshoot complex problems, perform technical software configuration, and provide customer support
• Monitor and maintain an enterprise environment comprising Windows servers, Red Hat Enterprise Linux servers, and network appliances
• Assist mission partners with mobile-device VPN connectivity debugging, user-account and device management, and system/service-access troubleshooting
• Perform configuration updates and maintenance to patch, secure, and maintain systems
• Respond to and analyze issues degrading system or network performance to minimize downtime
• Address moderately complex technical issues using internal SOPs and team collaboration
• Create and update documentation for common issues and processes for the team knowledge base
• Provide input to optimize processes and improve environment efficiency
• Support occasional after-hours maintenance and critical-issue onsite callback support

Requirements

• Bachelor’s degree and 2-4 years of related experience, or Master’s degree with a minimum of 2 years of related experience
• Additional experience, education, and training may be considered in lieu of degree
• Active DoD Secret clearance or higher required prior to start
• DoD-8570 IAT Level II certification (Security+ CE) required within 6 months of hire date
• Experience with Windows Server, Active Directory, and DNS
• Experience with Linux (RHEL 8 or 9)
• Networking experience using Cisco, Aruba, and/or Juniper devices
• Experience with cybersecurity tools and scanning (ACAS, Tenable, or Ansible)
• Experience troubleshooting software applications, networking, Windows OS, and Linux OS issues
• Experience performing system administration tasks including installing, maintaining, monitoring, recovering, rebuilding, upgrading, and patching
• Experience researching technical solutions beyond internal SOPs
• Strong knowledge of systems and networking software, hardware, and protocols
• Willingness to work with multiple technologies and learn new technologies
• Ability to work with minimal supervision in daily operations and sustainment activities
• Ability to demonstrate good judgment and professionalism and communicate clearly
• Strong problem-solving, critical-thinking, and analytical skills
• Permanent 3rd shift availability: Sunday–Wednesday, 8:00 PM–6:00 AM
• Ability to provide 2-hour onsite callback support for critical issues

Core Competencies

Demonstrates expertise in supporting complex IT environments, including Windows and Linux systems, while providing exceptional customer support and troubleshooting capabilities. Proficient in system administration, network performance analysis, and maintaining security compliance within the DoD framework.

Highest-signal resume keywords

• Windows Server Administration
• Linux (RHEL 8 or 9) Management
• DoD-8570 IAT Level II Certification (Security+ CE)
• Networking Experience (Cisco, Aruba, Juniper)
• Technical Troubleshooting and Problem-Solving

ATS Optimization Keywords

Hard Skills

• Windows Server
• Active Directory
• DNS
• Linux (RHEL 8 or 9)
• Cybersecurity Tools (ACAS, Tenable, Ansible)
• System Administration
• Technical Software Configuration
• Network Performance Analysis
• Patching and Maintenance
• VPN Connectivity Debugging

Soft Skills

• Problem-Solving
• Critical-Thinking
• Analytical Skills
• Communication
• Professionalism

Certifications & Qualifications

• DoD Secret Clearance
• DoD-8570 IAT Level II Certification (Security+ CE)

Industry Keywords

• DoD Mobility Classified Capability (DMCC)
• GSM-O II
• Enterprise Environment
• SOPs
• Onsite Callback Support