Onsite Classified Systems Administrator — TS/SCI

MITRE; El Segundo (CA); On-site; USD 99,000 - 149,000; Full time

Job summary

MITRE in Los Angeles, CA seeks a full-time Systems Administrator for a classified lab environment. You will deploy, operate, and maintain IT systems with strict security controls, including Windows and Linux, VMware/Proxmox/Hyper-V, and storage and monitoring tools.

Applicants should have 5+ years of related experience and an active Top Secret/SCI clearance, with on-site work five days a week. The role covers patching, hardening, asset management, and support for site operations in a secure

Qualifications

• Typically requires a minimum of 5 years of related experience with a Bachelor’s degree; or 3 years and a Master’s degree; or a PhD with relevant experience who can immediately contribute at this job step; or equivalent combination of related education and work experience.
• Working knowledge of server and client operating systems (Win11, Srv22/25, RHEL 8+, Ubuntu Linux 22.04+).
• Fundamental understanding of lab IT architecture and security controls.

Responsibilities

• Patch and update Windows and Linux servers and desktops (RHEL, Ubuntu).
• Administer servers, desktops, and network switches; manage VMware ESXi, Proxmox, Hyper-V platforms.
• Maintain storage systems, repository mirrors (VSCode, Docker, PyPI) and backup/recovery (Commvault).
• Hardening and building Windows, Linux, and virtualization environments.
• Procurement and accountability of classified IT hardware and assets; track location and prevent loss.
• Coordinate equipment installation, moves, and disposal with security teams.
• Support site operations: escorting visitors and opening/closing classified spaces.
• Monitor power/HVAC and coordinate outages and restorations.

Skills

Windows Server

Linux Server

VMware ESXi

Hyper-V

Proxmox

PowerShell

Python

Top Secret Clearance

Education

Bachelor's degree

Tools

VMware ESXi

Proxmox

Hyper-V

GitLab

Prometheus/Grafana

Commvault

Job description

MITRE in Los Angeles, CA seeks a full-time Systems Administrator for a classified lab environment. You will deploy, operate, and maintain IT systems with strict security controls, including Windows and Linux, VMware/Proxmox/Hyper-V, and storage and monitoring tools.

Applicants should have 5+ years of related experience and an active Top Secret/SCI clearance, with on-site work five days a week. The role covers patching, hardening, asset management, and support for site operations in a secure