Senior Linux Systems Engineer — Remote

Lumen; Cheyenne (WY); Remote; USD 83,000 - 111,000; Full time

Job summary

Lumen seeks a Senior Linux Systems Administrator to design, build, and secure Linux-based infrastructure for a classified federal program. You will operate VMware and KVM virtualization, manage authentication, certificates, monitoring, and automation.

Remote in the U.S.; 5+ years of Linux experience, Ubuntu/RHEL expertise, Ansible, Python, GitLab CI/CD, and strong network/security skills. Includes DevOps duties and up to 20% travel.

Qualifications

• Six+ years of experience in Linux systems, infrastructure, network, security, or platform administration.
• Advanced administration experience with Ubuntu and RHEL.
• Strong command-line proficiency, including Bash scripting and CLI-based troubleshooting.
• Demonstrated experience designing and building production infrastructure from the ground up.
• Hands-on experience administering VMware ESXi, vCenter, and vSphere.
• Experience with KVM or comparable Linux-based virtualization technology.
• Experience administering Nessus or a comparable vulnerability-management platform.
• Experience managing SSL/TLS certificates and PKI concepts.
• Strong knowledge of LDAP, LDAPS, and Active Directory integration.
• Working knowledge of TCP/IP, routing, DNS, NTP, firewalls, networking troubleshooting.
• Experience with Ansible and infrastructure automation.
• Working knowledge of Python and Git.
• Experience supporting monitoring and logging tools such as Zabbix and Elastic Stack.
• Ability to troubleshoot across OS, virtualization, authentication, applications, and network infrastructure.
• Active TS clearance with current SSBI/T5R investigation and CI polygraph, if mandatory for the program.

Responsibilities

• Design and build secure Linux infrastructure from initial requirements through production implementation and operational handoff.
• Install, configure, administer, patch, harden, and troubleshoot Ubuntu and Red Hat Enterprise Linux systems.
• Perform advanced command-line administration using Bash and standard Linux utilities.
• Administer VMware ESXi, vCenter, and vSphere environments with hosts, VMs, storage, and backups.
• Build and maintain KVM-based virtualization environments and support migration between platforms.
• Provision physical and virtual servers and integrate with network, storage, DNS, NTP, and security services.
• Install, configure, maintain, and troubleshoot LDAP and Active Directory integrations.
• Manage the SSL/TLS certificate lifecycle, including SANs and renewal.
• Administer Nessus vulnerability-scanning infrastructure and remediation support.
• Maintain monitoring/logging platforms such as Zabbix and Elastic Stack.
• Troubleshoot network connectivity and security controls.
• Create and maintain automation using Ansible, Bash, and Python.
• Use Git and GitLab CI/CD for infrastructure code and deployment workflows.
• Read and modify Flask/Django apps as needed.
• Support REST API integrations between apps and infra.
• Document build guides and recovery procedures.
• Participate in upgrades, incident response, and lifecycle management.
• Travel 5–20% for on-site support.

Skills

Linux systems

Bash scripting

VMware ESXi

KVM virtualization

Nessus

LDAP/AD

SSL/TLS certificates

Ansible

Python

Git/GitLab CI/CD

Zabbix

Elastic Stack

Network troubleshooting

Tools

VMware ESXi

vCenter

Nessus

Ansible

GitLab CI/CD

Python

Zabbix

Elastic Stack

Job description

Lumen seeks a Senior Linux Systems Administrator to design, build, and secure Linux-based infrastructure for a classified federal program. You will operate VMware and KVM virtualization, manage authentication, certificates, monitoring, and automation.

Remote in the U.S.; 5+ years of Linux experience, Ubuntu/RHEL expertise, Ansible, Python, GitLab CI/CD, and strong network/security skills. Includes DevOps duties and up to 20% travel.