Senior Linux Architect - Secure AI-Ready Infra (Remote)

Lumen; Lansing (MI); Remote; USD 87,000 - 116,000; Full time

Benefits offered by this job

Health benefits

Life insurance

Wellness programs

Job summary

Lumen seeks 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, VMware and KVM virtualization, deployment, authentication services, vulnerability management, monitoring, and network connectivity.

The role combines infrastructure automation with DevOps responsibilities, including CI/CD, API integration, and troubleshooting applications interfacing with

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.
• 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 vulnerability-management platform.
• Experience managing SSL/TLS certificates and PKI concepts.
• Active LDAP/Active Directory integration knowledge.
• TCP/IP, routing, DNS, NTP, firewalls, switches troubleshooting.
• Ansible and infrastructure automation.
• Python and Git knowledge.
• Monitoring/logging tools such as Zabbix and Elastic Stack.
• Ability to troubleshoot across OS, virtualization, apps, and network infrastructure.
• Active TS clearance with current SSBI/CI polygraph, if applicable.

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 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 networking.
• Build and maintain KVM-based virtualization environments and migrate between platforms.
• Provision physical and virtual servers and integrate them with networks and security services.
• Install, configure, maintain, and troubleshoot LDAP and Active Directory integrations.
• Manage SSL/TLS certificates lifecycle and trust.
• Administer Nessus vulnerability-scanning infrastructure and remediation support.
• Maintain monitoring and logging platforms such as Zabbix and Elastic Stack.
• Troubleshoot network connectivity across routing, DNS, ports, and firewalls.
• Create automation with Ansible, Bash, and Python.
• Use Git and GitLab CI/CD to manage infrastructure code.
• Read and modify applications built with Flask or Django as needed.
• Support REST API integration between applications and infrastructure.
• Develop build guides, diagrams, and procedures; participate in upgrades and lifecycle management.
• This position requires 5–20% travel to customer sites.

Skills

Linux systems

VMware ESXi

KVM virtualization

Bash scripting

Python

Git

Ansible

Nessus

LDAP/AD integration

Networking (TCP/IP/DNS)

REST API integration

CI/CD

Security hardening

Tools

VMware ESXi

vCenter

vSphere

KVM

Nessus

Zabbix

Elastic Stack

GitLab CI/CD

Ansible

Python

Flask

Django

LDAP

Job description

Lumen seeks 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, VMware and KVM virtualization, deployment, authentication services, vulnerability management, monitoring, and network connectivity.

The role combines infrastructure automation with DevOps responsibilities, including CI/CD, API integration, and troubleshooting applications interfacing with