Senior Linux Systems Engineer - Remote, Secure Infra

Lumen; Denver (CO); Remoto; USD 87.000 - 116.000; Tempo pieno

Descrizione del lavoro

Lumen is seeking a Senior Linux Systems Administrator to design, build, secure, operate, and maintain Linux-based infrastructure for a federal program. The role emphasizes Ubuntu/RHEL, VMware ESXi, vCenter, and KVM virtualization, plus automation via Ansible and Python.

You will also handle LDAP/AD integration, SSL/TLS lifecycle, Nessus scanning, and monitoring with Zabbix and Elastic Stack. Remote work is available anywhere in the U.S. with some travel requirements.

Competenze

• 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 infrastructure.
• Active TS clearance with current SSBI/T5R investigation and CI polygraph, if mandatory for the program.

Mansioni

• Design and build secure Linux infrastructure from initial requirements through production implementation.
• Install, configure, administer, patch, harden, and troubleshoot Ubuntu and RHEL systems.
• Perform advanced command‑line administration using Bash and Linux utilities.
• Administer VMware ESXi, vCenter, and vSphere environments including hosts, VMs, storage, networking, and backups.
• Build and maintain KVM‑based virtualization environments and support migrations between platforms.
• Provision servers and integrate with network, storage, DNS, NTP, directory, monitoring, and security services.
• Install, configure, maintain, and troubleshoot LDAP/AD integrations and certificate trust.
• Manage SSL/TLS certificate lifecycle, including keys, SANs, renewal, and trust.
• Administer Nessus vulnerability scanning infrastructure and remediation workflows.
• Maintain monitoring/logging platforms such as Zabbix and Elastic Stack.
• Troubleshoot network connectivity, routing, DNS, ports, firewalls, NAT, and security controls.
• Create automation using Ansible, Bash, and Python.
• Use Git and GitLab CI/CD to manage infrastructure code and pipelines.
• Read and modify Flask/Django apps as needed for deployments.
• Support REST API integration across apps and infra.
• Maintain build guides, diagrams, procedures, and recovery docs.
• Participate in upgrades, incident response, capacity planning, and lifecycle mgmt.
• Travel 5‑20% to meet customers and service hardware onsite.

Conoscenze

Linux systems

Ubuntu

RHEL

Bash scripting

VMware ESXi

vCenter

KVM virtualization

Nessus

LDAP/AD integration

Python

Ansible

Git

GitLab CI/CD

Zabbix

Elastic Stack

REST APIs

Flask/Django basics

Security hardening

Strumenti

GitLab CI/CD

Descrizione del lavoro

Lumen is seeking a Senior Linux Systems Administrator to design, build, secure, operate, and maintain Linux-based infrastructure for a federal program. The role emphasizes Ubuntu/RHEL, VMware ESXi, vCenter, and KVM virtualization, plus automation via Ansible and Python.

You will also handle LDAP/AD integration, SSL/TLS lifecycle, Nessus scanning, and monitoring with Zabbix and Elastic Stack. Remote work is available anywhere in the U.S. with some travel requirements.