Senior Linux System Administrator

Overview TISTA Science and Technology is seeking a Senior 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 Senior Linux System Administrator is responsible for the planning, deployment, security, automation, and maintenance of enterprise Linux systems and infrastructure. This role ensures high availability, system integrity, performance optimization, and secure operations supporting critical business applications. Install, configure, maintain, and troubleshoot enterprise Linux systems including Red Hat Enterprise Linux and Solaris Manage user accounts, permissions, and authentication services. Perform patch management, upgrades, and lifecycle planning. Maintain storage, file systems, backups, and recovery procedures. Administer virtual environments. Support hybrid cloud infrastructure in Amazon Web Services and Microsoft Azure. Maintain core network services (DNS, DHCP, NFS, SSH, VPN). Develop scripts using Bash, Python, or similar languages. Implement automation using Ansible and Puppet. Automate provisioning, patching, compliance checks, and deployments. Implement system hardening, access controls, and security best practices. Manage firewalls, SELinux, and intrusion detection measures. Monitor logs and perform vulnerability remediation. Support compliance requirements such as CIS benchmarks, NIST, or HIPAA (if applicable). Implement system monitoring using Nagios, Zabbix, or Prometheus. Analyze performance metrics and optimize system resources. Perform root cause analysis and implement preventative solutions. Qualifications 5+ years of advanced Linux system administration experience. Expertise managing enterprise Linux environments. Experience with virtualization and cloud platforms. Strong scripting and automation skills. Competencies in Enterprise Linux administration. Competencies in Automation & Infrastructure as Code. Competencies in Security & compliance best practices. Competencies in Cloud and virtualization technologies. Competencies in Advanced troubleshooting & performance tuning. Competencies in Documentation & operational excellence. Preferred Certifications Red Hat Certified Engineer (RHCE) Linux Foundation certifications (LFCS/LFCE) AWS or Azure cloud certifications Education Bachelor's degree in computer science, electronics engineering or related technical discipline and 5+ years' work experience. Eight (8) years of additional relevant experience may be substituted for education (13 years total). Clearance The ability to pass a Tier 4/HIGH Background Investigation. Location Department of Veteran's Affairs (100% On-site) Sunday - Thursday (11:30 PM - 8:00 AM CST Time) Austin Information Technology Center (AITC) 1615 Woodward Street, Austin, TX 78741 #J-18808-Ljbffr TISTA Science and Technology