Remote Senior Linux & Virtualization Engineer

Lumen; Honolulu (HI); Remote; USD 87,000 - 116,000; Full time

Job summary

Lumen is seeking a Senior Linux Systems Administrator to design, build, secure, operate, and maintain Linux‑based infrastructure for a classified federal program. Focus areas include advanced Linux administration, virtualization (VMware/KVM), deployments, authentication services, vulnerability management, and monitoring.

The role includes DevOps duties, automation, CI/CD, and application support, with 5–20% travel. Remote across the U.S.

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 public‑key infrastructure concepts.
• Strong knowledge of LDAP, LDAPS, and Active Directory integration.
• Working knowledge of TCP/IP, routing, DNS, NTP, firewalls, switching, ports, 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 operating systems, virtualization, authentication, applications, and network infrastructure.
• Active TS clearance with current SSBI/T5R investigation and CI polygraph, if those remain 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 diagnostic and management utilities.
• Administer VMware ESXi, vCenter, and vSphere environments, including hosts, virtual machines, templates, storage, virtual networking, certificates, resource allocation, backups, and recovery.
• Build and maintain KVM‑based virtualization environments and support evaluation or migration between virtualization platforms.
• Provision physical and virtual servers and integrate them with network, storage, DNS, NTP, directory, monitoring, backup, and security services.
• Install, configure, maintain, and troubleshoot LDAP and Active Directory integrations, including LDAP, LDAPS, bind accounts, directory searches, groups, permissions, and certificate trust.
• Manage the SSL/TLS certificate lifecycle, including private keys, certificate requests, SANs, certificate installation, chain validation, renewal, expiration tracking, and trust troubleshooting.
• Administer Nessus vulnerability‑scanning infrastructure, maintain scan configurations and schedules, analyze findings, and support remediation and validation.
• Maintain monitoring and logging platforms such as Zabbix and Elastic Stack.
• Troubleshoot network connectivity involving routing, DNS, ports, protocols, firewalls, switches, NAT, access controls, and application‑to‑system communication.
• Create and maintain automation using Ansible, Bash, and Python.
• Use Git and GitLab CI/CD to manage infrastructure code, scripts, configurations, and deployment workflows.
• Read, troubleshoot, and make limited modifications to applications or services developed with frameworks such as Flask or Django.
• Support REST API integration between applications, infrastructure platforms, and network or security elements.
• Develop and maintain accurate build guides, system diagrams, configuration records, operational procedures, backup procedures, and recovery documentation.
• Participate in system upgrades, incident response, problem management, capacity planning, and lifecycle management.
• This position requires between 5‑20% Travel to accommodate customer meetings and servicing hardware on‑site

Skills

Linux administration

Bash scripting

VMware ESXi & vCenter

KVM virtualization

Nessus

LDAP/AD integration

SSL/TLS certificates

Python

Git

Ansible

Zabbix monitoring

Elastic Stack

REST API integration

Networking basics

Education

Tools

VMware ESXi/vCenter

KVM virtualization

GitLab CI/CD

Flask

Django

Kubernetes

Job description

Lumen is seeking a Senior Linux Systems Administrator to design, build, secure, operate, and maintain Linux‑based infrastructure for a classified federal program. Focus areas include advanced Linux administration, virtualization (VMware/KVM), deployments, authentication services, vulnerability management, and monitoring.

The role includes DevOps duties, automation, CI/CD, and application support, with 5–20% travel. Remote across the U.S.