Senior System Administrator

At MITRE, your passion fuels work that impacts our nation and improves lives. This is where your skills strengthen national security, cybersecurity, health, transportation, and citizen services. We’re a nonprofit engineering, applied research, and advanced technology organization working in the public interest. With objectivity and integrity at our core, we lead federally funded research and development centers for U.S. government agencies – collaborating with industry and academia to deliver integrated, high-impact solutions that advance our nation’s health, security, and prosperity. Our people tackle the toughest technical challenges, supported by competitive benefits, meaningful career development, and a culture of innovation, collaboration, and technical excellence. Choose MITRE for a career with purpose — and help shape the future.The R310 Classified Systems Engineering Department delivers secure, mission-critical information technology services for classified research and operations, ensuring highly controlled computing environments remain reliable, compliant, and available. The department designs, operates, and sustains classified infrastructure, including systems, networks, storage, and access controls, while meeting stringent security and regulatory requirements. In parallel, R310 actively reduces risk and technical debt, mitigates compliance drift, and modernizes platforms to support evolving mission needs, enabling classified programs to execute with confidence, resilience, and operational focus.Roles & Responsibilities:The team seeks a full-time Systems Administrator to support the deployment, operation, and maintenance of IT systems in a classified lab environment. This role is best suited for someone who has prior experience working as a classified IT Systems Administrator. This is an on-premises position in our Los Angeles, CA facility. The successful candidate will have experience in:Patching and updating Windows and Linux (RHEL, Ubuntu) server and desktop operating systemsPerform general systems administration (patching, updates, user support) of:Windows & Linux desktops and serversNetwork switches (preferred)VMware ESXi, Proxmox (Debian), Microsoft Hyper-V platformsNetwork Storage SystemsRepository mirrors, such as: VSCode, Docker, PypiBackup and recovery/disaster recovery platforms such as CommvaultMaintenance of other systems/services according to project needs (SIEMs, Gitlab, Prometheus/Grafana and other monitoring tools, miscellaneous web servers, etc.,)Building and hardening Windows, Linux, virtualization (VMWare, Proxmox, Hyper-V) systemsSupport procurement, management and accountability of Classified IT hardware and propertyDesign future IT infrastructure upgrades to support changing site needsTrack equipment location, status, and movement into/out of classified spaces; maintain records to support audits and inventoriesMaintain a company purchase card; manage classified equipment and subcontract purchases IAW acquisition policiesCoordinate equipment installation, disposition, turn-in, or destruction activities as necessary with other Global Security teams and relevant stakeholdersPlan and execute equipment moves and transfers associated with facility transitions ensuring proper approvals and documentation are maintainedSupport Site Operations team in day-to-day security operations. Assist with escorting cleared and uncleared visitorsAssist in opening and closing the site’s classified spacesMonitor power and HVAC status impacting classified spaces; coordinate repairs with facilities manager and assistant site lead during outages; notify affected project personnel of outages, impacts, and restoration timelinesBasic 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. Fundamental understanding of VOIP and VTC systems and their troubleshooting.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 both written and verbal.Ability to function effectively in a dynamic, fast-paced environment.Ability to collaborate effectively with others.Must have an active Top Secret U.S Government issued Security Clearance with the ability to obtain and maintain a Top Secret/SCI U.S. Government issued Security Clearance. Per the U.S. Government’s eligibility requirements, you must be a U.S Citizen to be considered for a security clearance.This position has an on-site requirement of 5 days a week on-site.Preferred Qualifications:Active TS/SCI with CI Poly Security Clearance.Security+ Certification / 8570 Certification – IAT Level II or meets 8140 requirements.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 SecretThis requisition requires the hired candidate to have or obtain, within one year from the date of hire, the following clearance(s):Top Secret/SCISalary compensation range and midpoint:$99,200 - $124,000 - $148,800 AnnualWork Location Type:OnsiteCommitment to Non-DiscriminationAll 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. 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