Linux/UNIX System Administrator

Overview

TISTA Science and Technology is seeking a Linux/UNIX System Administrator to join our growing team.

At TISTA, you’ll do meaningful, mission ‑ driven work that improves lives alongside teammates you trust and leaders who are transparent and supportive. We invest in your learning and internal mobility so you can build a career that keeps advancing. We’re proud to serve and hire Veterans, and we put people first in everything we do.

TISTA associates enjoy above Industry Healthcare Benefits, Remote Working Options, Paid Time Off, Training/Certification opportunities, Healthcare Savings Account & Flexible Savings Account, Paid Life Insurance, Short-term & Long-term Disability, 401K Match, Professional development reimbursement, Employee Assistance Program, Paid Holidays, Military Leave, and much more!

Responsibilities

The Multi-Cloud Linux/UNIX Systems Administrator is responsible for administering enterprise Linux systems and cloud infrastructure across AWS, Azure, Google Cloud, and OCI. This role involves OS installation, maintenance, troubleshooting, monitoring, and security hardening in both on‑premise and multi‑cloud environments. The position supports 24x7x365 operations, including alternate shifts, and requires adherence to SOPs, security standards, and change‑control procedures.

• Perform routine Linux/UNIX system administration tasks, maintain logs, and ensure system efficiency and reliability.

• Troubleshoot systems, networks, and high‑availability environments; apply debugging protocols and implement corrective actions.

• Install operating systems using automated tools (Kickstart, Jumpstart, Ignite) and follow all SOPs.

• Apply VA‑approved OS hardening, configure file systems and backup clients, and install layered software (Apache, WebLogic, Oracle DB, Tuxedo).

• Apply OS patches, firmware updates, and vendor patch sets; manage user accounts; monitor system logs and escalate issues as needed.

• Implement security hardening per Service Requests and Change Requests; follow local SOPs for daily operations.

• Support incident and problem resolution; participate in fault isolation; open vendor support cases when needed.

• Resolve OS-related issues during scheduled maintenance windows.

• Administer Linux systems across AWS, Azure, Google Cloud, and OCI; troubleshoot cloud production issues across compute, storage, networking, and identity services.

• Perform cloud patching, vulnerability remediation, controlled maintenance, and ensure monitoring and backup readiness across platforms.

Qualifications

• Proven Linux/UNIX system administration experience, including complex troubleshooting and high‑availability systems.

• Hands‑on experience with automated provisioning (Kickstart, Jumpstart, Ignite).

• Knowledge of OS patching, security hardening, monitoring, and backup tools.

• Familiarity with Apache, WebLogic, Oracle DB, and Tuxedo.

Preferred Certifications

• Linux Administration certification strongly preferred.

• AWS, Azure, OCI, automation, or security certifications.

Education:

• Bachelor’s degree in computer science, electronics engineering or related technical discipline

• Eight (8) years of additional relevant experience may be substituted for education

Clearance:

• The ability to pass a Tier 4/HIGH Background Investigation

Location:

• Department of Veteran's Affairs (100% On-site)

• Monday - Friday (8:00 AM - 4:30 PM CST Time)

• Austin Information Technology Center (AITC)

1615 Woodward Street,

Austin, TX 78741