Senior Administrative Assistant
Employer: Amentum · Location: Richland, Washington · Posting: AMT-47fd55f81b02 · Type: Full-Time · Pay: $68,645-$101,585/yr
Duties
The Administrative Assistant will report to and provide administrative support for the WTCC Amentum Plant Manager and Plant Management department. Under general supervision and acting on own initiative, performs diverse and advanced clerical and administrative duties for Plant Management Department and senior-level management. Provides Amentum systems/process support for Amentum project leadership and back up support for Amentum Executive Admin supporting the Deputy General Manager and Mission Readiness Manager. Assignments will involve work of a confidential nature and require a basic knowledge of best practices and develop knowledge of policies, practices, and procedures of the company, group, project and department. This position shall be performed under the day-to-day direction, control, and supervision of WTCC REQUIREMENTS/SPECIFICATIONS Education: High School Diploma or equivalent and advanced administrative/secretarial training and experience Experience: Minimum 8 years of prior related administrative experience. Requires Subject Matter Expert (SME)-level knowledge of commonly used Microsoft applications such as Word, Excel, and PowerPoint. Experience with Workday and Power BI is preferred. MAJOR RESPONSIBILITIES/DUTIES/TASKS Establish and maintain good working relations with both internal and external contacts. Maintain confidentiality of sensitive information. Operate or use equipment such as computers and software, copiers, telephones, and other related office equipment. Compile and arrange a variety of interoffice memoranda, letters, reports, presentations and other classified or unclassified information. Receive, document, post and record classified or unclassified information. Track deliverables established by manager. Read and abstract, for letters, reports, meeting agendas as needed, and other correspondence, relevant information for manager’s use. Maintain file of important matters for senior managers' attention. Independently schedule and reschedule appointments based on senior manager's commitments and priorities. Coordinate complex travel arrangements and travel itineraries. Prepare detailed expense reports using Concur or other expense report software, as appropriate. Prepare and proofread standard forms, correspondence, reports, etc. Assemble, copy, and distribute documentation packages. Draft proposed response or suggest a course of action. Develop and produce a variety of presentations. Keep abreast of key issues, commitments, and priorities of manager(s). Research information and compile summary reports. Extract data from reference material, either semi-technical or non-technical in scope. Compile, analyze, and prepare or help prepare information for presentations, studies, or reports. Coordinate meetings, arrange for facilities, equipment, and refreshments. Organize material for meetings, presentations, and training sessions. Prepare, collect, review, and distribute meeting agendas, information packets, and minutes. May operate a variety of audiovisual equipment in the presentation of programs and conferences. Support the Waste Treatment Plant Nuclear Safety Quality Culture by emphasizing the values of safety and quality in the performance of work to protect self, others, and the environment. This job description is not intended to include every duty, task, or instruction for which an employee is responsible. Other tasks may be assigned, based on business needs and the department supervisor’s request. SUPERVISORY RESPONSIBILITIES NA PHYSICAL REQUIREMENTS (OFNM) Office Field Non-Manual Performs deskwork, including writing, computer workstation processes, and telephone operations. Arranges for and\or performs presentations, oral reports, planning meetings, and other formal or informal contacts, requiring long periods of sitting. This position is located at the Construction Site (22 miles north of Richland) and works a 4 x 10 schedule, M-Th, 6:30 a.m. to 5 p.m. Must be authorized to work and remain in the United States without Amentum visa sponsorship now or in the future. Must be able to complete and pass a pre-employment drug screen and background check which includes verification of employment and education. Must be able to obtain a Department of Energy badge for access to the Hanford Site. (Even if teleworking, must still be able to comply with security requirements to obtain a badge.) Non-U.S. citizens from countries identified by the Department of Energy as posing heightened security concerns—including sensitive countries, state sponsors of terrorism, countries of risk, and other designated countries –are subject to additional security requirements. Amentum is a global company with a heritage dating back more than 100 years and delivering solutions in nuclear energy, infrastructure, operations and maintenance, and national security. Our predecessors helped build Hoover Dam, protected fighting forces in World War II, and supported the Manhattan Project. Today, our teams clean up legacy nuclear waste around the world, manage the United Kingdom’s defense portfolio, design programs and tests for Navy submarine electronic systems, and provide integrated supply chain services needed in developing countries during the pandemic. Amentum has joined with Bechtel to create an LLC, known as the Waste Treatment Completion Company (WTCC) Join us as we make history at the Hanford Vit Plant, known as the Waste Treatment and Immobilization Plant. We are designing and building a one-of-a-kind facility that will turn radioactive and chemical waste left over from World War II and Cold War plutonium production into a form safe for disposal. Your efforts will help protect the nearby Columbia River and the communities, salmon, and wildlife along its shorelines throughout the Northwest. Sitting at the confluence of the Columbia, Snake and Yakima rivers near two mountain ranges, our community provides access to year-round outdoor recreation, 300 days of sun a year, more than 200 wineries within a 50-mile radius, and the amenities of large cities just a three-hour drive (or short flight) to Seattle and Portland.
Compensation
Compensation Details: $68,644.55 - $101584.72 The compensation range or hourly rate listed for this position is provided as a good-faith estimate of what the company intends to offer for this role at the time this posting was issued. Actual compensation may vary based on factors such as job responsibilities, education, experience, skills, internal equity, market data, applicable collective bargaining agreements, and relevant laws. Benefits Overview: Our health and welfare benefits are designed to support you and your priorities. Offerings include: Health, dental, and vision insurance Paid time off and holidays Retirement benefits (including 401(k) matching) Educational reimbursement Parental leave Employee stock purchase plan Tax-saving options Disability and life insurance Pet insurance Note: Benefits may vary based on employment type, location, and applicable agreements. Positions governed by a Collective Bargaining Agreement (CBA), the McNamara-O'Hara Service Contract Act (SCA), or other employment contracts may include different provisions/benefits. Original Posting: 07/29/2026 - 08/09/2026 Amentum anticipates this job requisition will remain open for at least three days, with a closing date no earlier than three days after the original posting. This timeline may change based on business needs. Amentum is proud to be an Equal Opportunity Employer. Our hiring practices provide equal opportunity for employment without regard to race, sex, sexual orientation, pregnancy (including pregnancy, childbirth, breastfeeding, or medical conditions related to pregnancy, childbirth, or breastfeeding), age, ancestry, United States military or veteran status, color, religion, creed, marital or domestic partner status, medical condition, genetic information, national origin, citizenship status, low-income status, or mental or physical disability so long as the essential functions of the job can be performed with or without reasonable accommodation, or any other protected category under federal, state, or local law. Learn more about your rights under Federal laws and supplemental language at Labor Laws Posters .