Linux Systems Administrator

Linux Systems Administrator

Job Type: Full-Time
Location: Killeen, Texas
Department: Systems Support

We are looking for an experienced Linux Systems Administrator to administer, monitor, secure, and maintain enterprise Linux environments. The ideal candidate will have strong hands-on experience with RHEL, Ubuntu, and CentOS
, along with familiarity with Windows Server, VMware, and containerized environments such as Open Shift and Kubernetes.

This role will provide Tier 2/3 technical support, troubleshoot complex infrastructure issues, support enterprise applications, and collaborate closely with development, Dev Ops, and security teams.

• Administer, monitor, maintain, and troubleshoot Linux systems
  , including RHEL, Ubuntu, and CentOS.
• Install, configure, secure, and optimize Linux services such as systemd, SSH, Apache/Nginx, cron
  , and related services.
• Perform Linux system upgrades, patching, configuration, and security hardening.
• Provide Tier 2/3 support for escalated server and infrastructure issues.
• Identify, research, and implement Linux and Open Shift solutions and applications.
• Support and troubleshoot enterprise applications and their underlying server environments.
• Manage Linux security administration in collaboration with information security teams.
• Monitor system health, performance, availability, and capacity, and proactively address potential issues.
• Collaborate with development, Dev Ops, infrastructure, and security teams to support application and infrastructure requirements.
• Provide technical guidance and support to IT teams on Linux configuration and administration.
• Maintain awareness of Linux and Open Shift updates, changes, and new releases, and communicate relevant changes to stakeholders.
• Work with vendors and internal teams to resolve technical issues and support applications and infrastructure.
• Create and maintain accurate technical documentation, processes, and standard operating procedures.
• Participate in a weekly on-call rotation to respond to after-hours infrastructure issues.
• Travel to other data centers or company locations as required.
• Perform other duties and assignments as needed.

• Provide administration and support for Windows Server environments and related services.
• Working knowledge of Active Directory, Group Policy, DNS, DHCP, and Power Shell
  .
• Administer VMware vSphere/ESXi environments, including:
  • Virtual machine deployment
  • Resource management
  • VM administration
  • Snapshots
  • Basic troubleshooting

• Support and administer Open Shift/Kubernetes environments.
• Install, configure, maintain, upgrade, monitor, and troubleshoot Open Shift/Kubernetes clusters.
• Support containerized applications using Open Shift, Kubernetes, or Docker
  .
• Stay current with developments, updates, and best practices in container orchestration technologies.

• Ensure compliance with security standards, patching schedules, and organizational policies.
• Apply security hardening practices to Linux and server environments.
• Understand common web application and infrastructure vulnerabilities
  , risks, and appropriate countermeasures.
• Work closely with security teams to identify and remediate security issues.
• Maintain confidentiality of sensitive customer, business, and internal information.

• Bachelor's degree in Computer Science, Computer Engineering, Information Technology, or a related field preferred. Equivalent relevant experience may be considered.
• Strong hands-on experience administering Linux servers
  , preferably RHEL, Ubuntu, and/or CentOS.
• Strong troubleshooting and analytical skills with the ability to independently research and resolve complex technical issues.
• Experience with Linux system administration, configuration, patching, and security.
• Knowledge of Windows Server administration and core services.
• Familiarity with VMware vSphere/ESXi.
• Knowledge of web/application server technologies such as Apache and Nginx.
• Understanding of server and web application security principles.
• Ability to manage multiple priorities and meet project deadlines.
• Strong written and verbal communication skills.
• Ability to collaborate effectively with technical and non-technical stakeholders.
• Ability to work independently as well as part of a broader IT team.
• Willingness to participate in an on-call rotation.

• Experience with Open Shift, Kubernetes, and/or Docker
  .
• Experience installing, configuring, upgrading, monitoring, and troubleshooting Open Shift/Kubernetes clusters.
• Familiarity with CI/CD pipelines, Git, and Dev Ops practices
  .
• Experience with Infrastructure as Code (IaC) tools such as Terraform and Ansible
  .
• Experience with monitoring and logging platforms such as Prometheus, Grafana, ELK, or Splunk
  .
• Familiarity with Linux security hardening and patch management.
• Certifications such as RHCSA, RHCE, CKA, CKAD, or Open Shift certifications are a plus.

We are looking for someone who is technically…