Remote Senior Linux & Security Infrastructure Engineer

Lumen; Atlanta (GA); Remote; USD 83,000 - 111,000; Full time

Job summary

Lumen seeks a Senior Linux Systems Administrator to design, secure, operate, and maintain Linux infrastructure for a classified federal program. Responsibilities include Ubuntu/RHEL administration, VMware/KVM virtualization, LDAP/AD integration, SSL/TLS lifecycle, Nessus management, and automation using Ansible, Bash, and Python.

This remote opportunity supports US locations and requires strong DevOps practices, CI/CD with GitLab, and experience with Flask/Django applications.

Qualifications

• Six+ years of Linux systems/infrastructure experience.
• Advanced admin experience with Ubuntu and RHEL.
• Strong CLI, Bash, and troubleshooting skills.
• Experience building production infrastructure from the ground up.
• Hands-on VMware ESXi, vCenter, and vSphere administration.
• Experience with KVM virtualization.
• Experience with Nessus or similar vulnerability management.
• Experience managing SSL/TLS certificates and PKI concepts.
• Knowledge of LDAP/AD integration.
• Scripting with Python and automation with Ansible.
• Version control with Git; CI/CD with GitLab.
• Monitoring/logging with Zabbix and Elastic Stack.
• Ability to troubleshoot across OS, virtualization, apps, and network.

Responsibilities

• Design and build secure Linux infrastructure from requirements to production handoff.
• Install, configure, patch, and troubleshoot Ubuntu and RHEL systems.
• Perform advanced Bash-based administration and diagnostics.
• Manage VMware ESXi/vCenter/vSphere environments and related storage/networking.
• Build/maintain KVM virtualization environments and migrations.
• Provision servers and integrate with network, DNS, NTP, directory, backup, and security services.
• Manage LDAP/AD integrations and certificate trust.
• Oversee SSL/TLS lifecycle and PKI administration.
• Administer Nessus vulnerability scanning configurations and remediation.
• Maintain monitoring/logging with Zabbix and Elastic Stack.
• Develop automation with Ansible, Bash, Python; use Git/GitLab for infrastructure code.
• Support REST API integrations and Flask/Django apps; assist incident response.

Skills

Linux administration

Ubuntu

RHEL

Bash scripting

VMware ESXi

vCenter

vSphere

KVM virtualization

Nessus

LDAP/AD

TLS certificates

Python

Ansible

Git

GitLab CI/CD

Flask/Django

REST APIs

Zabbix

Elastic Stack

TCP/IP networking

Tools

VMware ESXi

vCenter

vSphere

KVM

Nessus

Zabbix

Elastic Stack

Ansible

Git

GitLab CI/CD

Python

Flask

Django

LDAP

AD

Job description

Lumen seeks a Senior Linux Systems Administrator to design, secure, operate, and maintain Linux infrastructure for a classified federal program. Responsibilities include Ubuntu/RHEL administration, VMware/KVM virtualization, LDAP/AD integration, SSL/TLS lifecycle, Nessus management, and automation using Ansible, Bash, and Python.

This remote opportunity supports US locations and requires strong DevOps practices, CI/CD with GitLab, and experience with Flask/Django applications.