Why choose between doing meaningful work and having a fulfilling life? At MITRE, you can have both. That's because MITRE people are committed to tackling our nation's toughest challenges—and we're committed to the long-term well-being of our employees. MITRE is different from most technology companies. We are a not-for-profit corporation chartered to work for the public interest, with no commercial conflicts to influence what we do. The R&D centers we operate for the government create lasting impact in fields as diverse as cybersecurity, healthcare, aviation, defense, and enterprise transformation. We're making a difference every day—working for a safer, healthier, and more secure nation and world. Our workplace reflects our values. We offer competitive benefits, exceptional professional development opportunities for career growth, and a culture of innovation that embraces adaptability, collaboration, technical excellence, and people in partnership. If this sounds like the choice you want to make, then choose MITRE - and make a difference with us. Department Summary: The team seeks a full-time Senior Systems Administrator to support the deployment, operation, and maintenance of IT systems in Classified lab environment. This is a role best suited for someone who has prior experience working as a classified IT Systems Administrator. This is an on-premises position on our McLean Va campus. Roles & Responsibilities: + Building and hardening Windows, Linux, Hypervisor systems, such as VMware + Patching and updating Windows and Linux (RHEL, Ubuntu) server and desktop operating systems + Updating anti-virus software definitions for Windows/Linux server and workstation + User maintenance activities on both Windows and Linux operating systems + Perform general systems administration (patching, updates, user support) of: + Windows & Linux desktops and servers + Network switches + VMware ESXi, vCenter platforms + Network Storage Systems + Configuring Certificate Services & Authority + Performing Server Backups + Powershell scripting for automation, task scheduling and systems administration + Maintenance of other systems/services according to project needs (Splunk, Nessus Scanner/Tenable Security Center, Trellix Endpoint Security, Forescout, etc..) Basic 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. + Top Secret-level clearance + Working knowledge of server and client operating systems. (Win10, Srv2016+, RHEL, Ubuntu Linux)  + Fundamental understanding of lab IT architecture   + Fundamental understanding of system administration, network, and operating system hardening techniques.  + Fundamental understanding of operating system command-line tools.  + Ability to interface with customers and provide a high level of customer service  + Ability to function effectively in a dynamic, fast-paced environment.  + Ability to collaborate effectively with others + This position has an on-site requirement of 5 days a week on-site . Preferred Qualifications: + Security+ Certification / 8570 Certification – IAT Level II + Must earn certification within 6-months of hire date + Experience with one or more programming/scripting languages (Chef, Ansible, Powershell, Bash, Python, etc.) This requisition requires the candidate to have a minimum of the following clearance(s): Top Secret This requisition requires the hired candidate to have or obtain, within one year from the date of hire, the following clearance(s): Top Secret Work Location Type: Onsite Commitment to Non-Discrimination All qualified applicants will receive consideration for employment without regard to disability, status as a protected veteran or any other status protected by applicable federal, state, local or international law. MITRE intends to maintain a website that is fully accessible to all individuals. If you are unable to search or apply for jobs and would like to request a reasonable accommodation for any part of MITRE’s employment process, please email recruitinghelp@mitre.org for general support and collegerecruiting@mitre.org for intern positions. This service is for individuals requiring reasonable accommodation requests. Please note that vendor solicitations will not receive a reply. Benefits information may be found here (https://careers.mitre.org/us/en/benefits) . Copyright © 1997-2025, The MITRE Corporation. All rights reserved. MITRE is a registered trademark of The MITRE Corporation. Material on this site may be copied and distributed with permission only.