Senior Administrative Assistant

West Hills, California, USA
Full-time
$27.00–$42.00
Posted Nov 13, 2026

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Skills

Communication
Microsoft Excel
Microsoft Office
Operations

Job description

Work Schedule

Standard (Mon-Fri)

Environmental Conditions

Office

Job Description

As part of the Thermo Fisher Scientific team, you’ll discover meaningful work that makes a positive impact on a global scale. Join our colleagues in bringing our Mission to life every single day to enable our customers to make the world healthier, cleaner and safer. We provide our global teams with the resources needed to achieve individual career goals while helping to take science a step beyond by developing solutions for some of the world’s toughest challenges, like protecting the environment, making sure our food is safe or helping find cures for cancer.

LOCATION : On-site West Hills, CA. Relocation assistance is NOT provided.

•Must be legally authorized to work in the United States without sponsorship.

•Must be able to pass a comprehensive background check, which includes a drug screening.

DESCRIPTION :

Join us as a Senior Administrative Assistant providing high-level support to executive leadership at Thermo Fisher Scientific. You'll contribute to our mission of making the world healthier, cleaner and safer by managing complex calendars, coordinating travel, facilitating communications, and ensuring effective office operations.

In this role, you'll work closely with senior leaders, handling confidential information with discretion while demonstrating exceptional organizational abilities and attention to detail. You'll coordinate meetings and events, prepare professional communications and presentations, manage expenses and vendor relationships, and serve as a key liaison between executives and internal/external stakeholders. Your thoughtful approach and ability to anticipate needs will help drive operational excellence across the organization.

REQUIREMENTS :

Education :

•High school diploma required. Associate’s degree in Secretarial Science, Business, or related field preferred.

Experience :

•4 years of executive administrative assistant or site administrator experience in a professional office environment.

•3 years supporting Director, senior level leaders or functional heads.

•Experience in a large, global matrix organization strongly preferred.

•Proficiency in Microsoft Office Suite (Outlook, PowerPoint, Excel, Word, Teams)

•Proficiency with expense management systems (e.g., Concur) and virtual meeting platforms

•Experience supporting internal communications, events, or workplace operations is a plus.

Knowledge, Skills, Abilities:

•Strong organizational, analytical, and communication skills with an ability to anticipate what needs to be completed.

•Experience with internal communications tools, digital signage systems, or intranet platforms (preferred).

•Excellent written and verbal communication skills. Infallible proof reading and spelling.

•High level of discretion when handling sensitive or confidential information.

•Ability to manage multiple priorities and meet deadlines in a fast-paced, matrixed environment.

•Creative problem-solver with an eye for detail and continuous improvement.

•Ability to work autonomously while supporting leaders across the site.

•Flexible and adaptable, with the ability to respond to last-minute changes while maintaining poise and a positive can do outlook.

We offer competitive remuneration, annual incentive plan bonus scheme, healthcare, company 401k, and a range of employee benefits! Thermo Fisher Scientific offers employment with an innovative, forward-thinking organization, and outstanding career and development prospects. We offer an exciting company culture that stands for integrity, intensity, involvement, and innovation.

Thermo Fisher Scientific is an EEO/Affirmative Action Employer and does not discriminate based on race, color, religion, sex, sexual orientation, gender identity, national origin, protected veteran status, disability, or any other legally protected status. We will ensure that individuals with disabilities are provided a reasonable accommodation to participate in the job application or interview process, to perform critical job functions, and to receive other benefits and privileges of employment. Please contact us to request an accommodation.

Compensation and Benefits

The hourly pay range estimated for this position based in California is $27.00–$42.00.

This position may also be eligible to receive a variable annual bonus based on company, team, and/or individual performance results in accordance with company policy. We offer a comprehensive Total Rewards package that our U.S. colleagues and their families can count on, which includes:

•A choice of national medical and dental plans, and a national vision plan, including health incentive programs

•Employee assistance and family support programs, including commuter benefits and tuition reimbursement

•At least 120 hours paid time off (PTO), 10 paid holidays annually, paid parental leave (3 weeks for bonding and 8 weeks for caregiver leave), accident and life insurance, and short- and long-term disability in accordance with company policy

•Retirement and savings programs, such as our competitive 401(k) U.S. retirement savings plan

•Employees’ Stock Purchase Plan (ESPP) offers eligible colleagues the opportunity to purchase company stock at a discount

For more information on our benefits, please visit: https://jobs.thermofisher.com/global/en/total-rewards