Administrative Assistant, Senior

Join Mitre: Total Rewards Administrative Support 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 challengesand 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 dayworking 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. The Total Rewards department designs and delivers the full value proposition for employees, combining Compensation, Benefits, and Wellbeing to attract, motivate, and retain talent. We manage competitive and equitable pay programs, comprehensive benefits offerings, and wellbeing initiatives that support employees across life stages. Across all areas, we drive compliance, data-informed decision making, and clear communications to strengthen engagement and help employees thrive. Roles & Responsibilities: Provide senior-level administrative support to Total Rewards leaders and team members, including complex calendar management and meeting coordination across time zones Coordinate end-to-end meeting logistics (agendas, materials, notes, minutes/action items, and follow-up) to ensure timely completion of commitments Serve as a point of contact for routine inquiries and requests; triage and route items appropriately while maintaining confidentiality Support onboarding and offboarding logistics (e.g., access requests, workspace/logistics coordination, schedules, distribution lists, and coordination with partners) Assist with procurement and financial administration activities such as purchase requisitions, invoice tracking, and expense report support in accordance with policy Maintain organized electronic records and shared repositories, applying consistent naming/versioning practices and supporting access controls Identify opportunities to streamline administrative processes; document procedures and help implement improvements Support department operating rhythms (e.g., staff meetings, quarterly planning, vendor touchpoints) by maintaining schedules, materials, and action registers Track and reconcile departmental deliverables and deadlines; provide status updates and reminders to enable timely completion of commitments Coordinate travel logistics as needed, including itineraries and meeting arrangements, in compliance with organizational guidelines Perform other related administrative duties in support of Total Rewards initiatives across Compensation, Benefits, and Wellbeing Basic Qualifications: Typically requires a minimum of 3 years of related experience with a High School Diploma or equivalent in education, or 2 years' experience and an associate degree, or equivalent combination of education and related work experience. Demonstrated experience providing administrative support in a fast-paced environment with competing priorities and shifting deadlines Proficiency with office productivity tools (e.g., Microsoft Outlook, Word, Excel, PowerPoint, and collaboration tools such as Teams/SharePoint or equivalent) Strong written communication skills, including drafting clear communications and capturing meeting notes/action items Demonstrated ability to manage complex calendars, coordinate meetings, and track deliverables with accuracy and follow-through Proven attention to detail and strong organizational skills, including effective document management practices Ability to handle sensitive information with discretion and maintain confidentiality This position requires a minimum of 50% hybrid on-site Preferred Qualifications: Experience supporting Human Resources, Compensation, Benefits, Wellbeing, or another Total Rewards-adjacent function Experience supporting senior leaders and coordinating complex, multi-stakeholder meetings Experience with procurement and financial administration workflows (e.g., requisitions, invoicing, expense reporting) Advanced proficiency in Excel (e.g., pivot tables, formulas) and strong PowerPoint formatting skills Experience maintaining SharePoint sites or structured shared drives, including permissions and version control Familiarity with HRIS, ticketing, or workflow tools (e.g., ServiceNow or equivalent) Demonstrated experience improving administrative processes through standardization, documentation, or automation Ability to collaborate effectively with leaders, peers, and cross-functional partners Salary compensation range and midpoint: $62,000 - $77,500 - $93,000 Annual Work Location Type: Hybrid 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 for general support and 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.

Created: 2026-03-13