Administrative Assistant (On-Site)

Discover your full potential. At Tetra Tech, we are collaborating with industry-leading experts for a sustainable future for our world. We combine consulting and engineering with advanced analytics and technology to solve the world's most complex challenges. Our innovation hubs across the globe will enable you to share ideas and best practices while growing your professional network. Wherever you are in your career journey, you will benefit from working with world-class engineers, scientists, and technical specialists.

At Tetra Tech, we are Leading with Science to solve the world's most complex challenges. Our industry-leading experts in engineering and consulting are committed to driving positive change in communities around the world. For over 50 years, we have been at the forefront of innovation and sustainability. Today we stand as a market leader, offering cutting-edge solutions in water, environment, energy, and international development. Our work has improved more than 625 million lives around the world.

Join Tetra Tech to make a real difference. Our work leverages cutting-edge technologies, advanced analytics, and the expertise of world-class scientists and engineers to create meaningful change around the world. Discover your full potential - join us to advance your career while leaving a lasting legacy.

Apply today and join the company that is Leading with Science®.

Tetra Tech is seeking an Administrative Assistant to join our team in our Diamond Bar, CA office. In this role, you will provide support to the managers and employees through a variety of tasks related to organization and communication. You will assist with the day-to-day operations of the office by doing tasks such as managing data reports, preparing documents, and providing support to project managers. The pay scale for this position is $22-$30 an hour, based on qualifications and experience.

Your Role :

• Greet and communicate with clients in a professional and courteous demeanor
• Assist with word processing letters and reports, using predefined styles and formatting
• Edit and format reports in MS Word, Excel, and PDF format
• Update and audit accounting spreadsheets and databases; perform data entry
• Prepare expense reports
• Perform clerical duties
• Assist and/or make travel arrangements for managers
• Assist with client billings
• Provide support services to various departments as needed
• Must be able to work between the hours of 8 AM - 5 PM Pacific Standard Time

Qualifications :

• Zero to five years of experience
• Ability to work and communicate effectively with a variety of personalities
• Proven ability to work in a fast-paced team environment
• Self-motivated
• High degree of organizational skills
• Ability to recognize efficient solutions
• High school diploma or general education degree (GED) required, college degree preferred

Success Factors :

• Excellent interpersonal and oral communication skills and professional telephone etiquette
• Ability to provide professional client service at the highest level
• Must be able to support multiple staff using strong time-management and organizational skills that reflect ability to perform and prioritize multiple tasks with attention to detail
• Proficiency in Microsoft applications (Outlook, Excel, Word)
• Knowledge of commonly used office practices, procedures, and concepts
• Follows through on tasks to successful completion
• Must work well independently with little supervision; high energy self-starter
• Willing to learn new skills and grow in the job as needed
• Willing to work overtime on occasion, as necessary
• Experience in accounting processes is also desirable

Benefits :

• Competitive salary
• Medical, dental, and vision benefits
• 401(k) with match
• Employee Stock Purchase Plan
• Flexible scheduling
• Opportunities for advancement and much more!

Life at Tetra Tech:
The perks of working at Tetra Tech include:

• Comprehensive and market-competitive benefits.
• Merit-based financial rewards.
• Flexibility and company-wide commitment to work/life balance.
• Collaborative team atmosphere that values the contributions of all employees.
• Learning and development opportunities for ongoing professional growth.

About Tetra Tech:
Tetra Tech is the leader in water, environment, and sustainable infrastructure, providing high-end consulting and engineering services for projects worldwide. With 25,000 employees working together, Tetra Tech provides clear solutions to complex problems by Leading with Science® to address the entire water cycle, protect and restore the environment, design sustainable and resilient infrastructure, and support the clean energy transition.

Tetra Tech is proud to be an Equal Opportunity Employer. All qualified candidates will be considered without regard to race, color, religion, national origin, age, disability, sexual orientation, gender identity, status as a protected veteran, or any other characteristic protected by law. Tetra Tech is a VEVRAA federal contractor and we request priority referral of veterans.

We invite applications from all interested parties.

Explore our open positions at Follow us on social media to learn more about our people, culture, and opportunities:
LinkedIn: @TetraTechCareers
X (Twitter): @TetraTechJobs

We thank all applicants for their interest, however, only those candidates selected for interviews will be contacted.

Please no phone calls or agencies.