Senior Linux Engineer, Remote, Virtualization & Security

Lumen; Topeka (KS); Remote; USD 83,000 - 111,000; Full time

Job summary

Lumen is seeking a Senior Linux Systems Administrator to design, build, and operate Linux-based infrastructure for a classified federal program, including VMware/KVM virtualization, authentication services, and vulnerability management. You will automate with Ansible, Python, and CI/CD pipelines, and support integration with REST APIs and security systems.

Open to candidates across the United States, this remote role emphasizes security, build automation, and ongoing lifecycle management of

Qualifications

• Six or more 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, and network 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, apps, and network infra.
• Active TS clearance with current SSBI/T5R investigation and CI polygraph, if required.

Responsibilities

• Design and build secure Linux infrastructure from initial requirements through production implementation and handoff.
• Install, configure, administer, patch, harden, and troubleshoot Ubuntu and RHEL systems.
• Perform advanced command-line administration using Bash and standard Linux utilities.
• Administer VMware ESXi, vCenter, and vSphere environments including hosts, VMs, storage, and virtual networking.
• Build and maintain KVM-based virtualization environments and migrate between platforms.
• Provision physical and virtual servers, integrating with network, storage, DNS, NTP, and security services.
• Manage LDAP/AD integrations, certificates, cert trust, and directory permissions.
• Oversee SSL/TLS certificate lifecycle, including renewals and trust troubleshooting.
• Administer Nessus vulnerability-scanning infrastructure and remediation support.
• Maintain monitoring/logging with Zabbix and Elastic Stack.
• Troubleshoot network routing, DNS, ports, firewalls, and application-to-system communication.
• Create automation using Ansible, Bash, and Python.
• Use Git and GitLab CI/CD to manage infrastructure code and deployments.
• Read/modify apps built with Flask or Django as needed.
• Support REST API integration between apps, infra, and network/security elements.
• Document build guides, diagrams, configs, procedures, and backups.
• Participate in system upgrades, incident response, capacity planning, and lifecycle management.
• This position requires between 5-20% travel for on-site customer meetings and servicing hardware.

Skills

Linux

Ubuntu

RHEL

Bash scripting

VMware ESXi

vCenter / vSphere

KVM virtualization

Nessus

SSL/TLS certificates

LDAP / Active Directory

Ansible

Python

Git

GitLab CI/CD

Zabbix

Elastic Stack

Flask

Django

Kubernetes

REST API

Networking / TCP/IP / DNS

Security hardening

Tools

VMware ESXi

vCenter

vSphere

Nessus

LDAP

Elastic Stack

Zabbix

GitLab CI/CD

Kubernetes

Flask

Django

Ansible

Python

Git

Job description

Lumen is seeking a Senior Linux Systems Administrator to design, build, and operate Linux-based infrastructure for a classified federal program, including VMware/KVM virtualization, authentication services, and vulnerability management. You will automate with Ansible, Python, and CI/CD pipelines, and support integration with REST APIs and security systems.

Open to candidates across the United States, this remote role emphasizes security, build automation, and ongoing lifecycle management of