Junior Administrative Assistant - Portland

Tetra Tech is adding a highly motivated and customer-focused Junior Administrative Assistant to support our Portland, Oregon office. This position plays an important role in maintaining efficient office operations and supporting employees who work in-office, hybrid, and remotely.

The successful candidate will assist with a variety of administrative, office coordination, customer service, and logistical support functions. This is an excellent opportunity for an early‑career administrative professional looking to develop new skills and grow within a collaborative consulting environment.

Portland, OR

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.

• Manage schedules and facilitate communication among team members.
• Handle office documentation and coordinate essential office logistics.
• Process mail and overnight shipping requests.
• Assist with employee expense reports.
• Prepare purchase requisitions.
• Support office staff with administrative tasks and special assignments.
• Assist with data entry, spreadsheets, databases, and records management activities.
• Reproduce large documents and project deliverables.
• Maintain document control systems in accordance with company standards.
• Cover front desk responsibilities and receive deliveries.
• Maintain visitor sign‑in logs and office security procedures.

• Maintain a clean, organized, and professional office environment.
• Maintain and organize office, kitchen, field equipment, safety equipment, and supply inventories.
• Coordinate ordering and stocking of office supplies.
• Maintain and clean two office kitchens.
• Coordinate office lunch orders and catering for meetings and events.
• Assist with maintenance and care of office plants.
• Serve as a liaison with building management in coordination with administrative staff.
• Serve as an IT liaison for reporting technical and server issues.
• Maintain office key fob inventory and online security systems.

• Provide professional customer service to employees, clients, and visitors.
• Support office events, including summer and holiday gatherings.
• Assist with scanning, copying, filing, invoice processing, and general office support.
• Follow through on assigned tasks to successful completion.
• Support a collaborative team environment while working independently as needed.
• Conduct activities in line with internal procedures, legislation, and industry standards.
• Pursue continuous professional development and maintain a high degree of discipline knowledge and awareness.
• Work in a safe manner at all times and report all health and safety incidents and concerns.
• Perform additional duties as required.

• High School Diploma or GED required.
• 1–2 years of administrative experience.
• Strong interpersonal and verbal communication skills.
• Excellent organizational and time‑management skills.
• Ability to prioritize multiple assignments and maintain attention to detail.
• Proficiency with:
  • Microsoft Outlook
  • Microsoft Word
  • Microsoft Excel
  • Microsoft Power Point
• Ability to work independently with minimal supervision.
• Willingness to learn and grow professionally.
• Must possess a valid driver’s license with a clean driving record without restrictions.

• 2–5 years of receptionist and/or administrative experience.
• Experience supporting office operations in a…