Senior Linux Infrastructure Architect (Remote)

Lumen; Trenton (NJ); Remote; USD 91,000 - 122,000; 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. The role emphasizes advanced Linux admin, VMware/KVM virtualization, IAM, vulnerability management, and automation. Remote work across the U.S.

is supported, with travel 5–20% for on-site meetings. Responsibilities include CI/CD, Ansible automation, REST API integration, and collaboration with security and network teams to ensure

Qualifications

• Six or more years of experience in Linux systems, infrastructure, network, security, or platform administration.

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

Ubuntu

RHEL

Bash scripting

Python

Git

GitLab CI/CD

Ansible

VMware ESXi

vCenter/vSphere

KVM virtualization

Nessus

LDAP/AD integration

SSL/TLS certificates

Zabbix

Elastic Stack

REST APIs

Flask/Django (preferred)

Networking fundamentals

Python scripting

Education

Six or more years in Linux systems/infrastructure roles

Tools

VMware ESXi

vCenter

vSphere

Nessus

Zabbix

Elastic Stack

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. The role emphasizes advanced Linux admin, VMware/KVM virtualization, IAM, vulnerability management, and automation. Remote work across the U.S.

is supported, with travel 5–20% for on-site meetings. Responsibilities include CI/CD, Ansible automation, REST API integration, and collaboration with security and network teams to ensure