Administrative Assistant - Part-time

Who We Are:

West Yost is a water resource management and engineering firm focused exclusively on water. Since our founding in 1990, we have partnered with public agencies including cities, counties, utilities, and water districts to plan, design, and deliver water, wastewater, and stormwater solutions that support safe, reliable, and resilient communities.

Our team of more than 265 professionals brings together expertise in groundwater, water supply, treatment, infrastructure, recycled water, stormwater, construction management, and operations technology. We support projects from early planning and permitting through design and construction and complement our engineering services with program management and public outreach to help clients move work forward and engage their communities.

We are proud to be certified as a Great Place to Work®, and to be recognized among Fortune’s® Best Workplaces in Consulting and Professional Services from 2023 to 2025, as well as a top‑ranked firm in the AEC Advisors Diversity Index. At West Yost, we are committed to being the water firm of choice for our clients and our team, advancing water resources for future generations through strong partnerships, practical solutions, and a shared commitment to quality.

We're looking for a dependable, organized Administrative Assistant to provide part‑time support to our Irvine office and team.

This is a great opportunity for someone who enjoys administrative work, takes pride in creating a welcoming and well‑run office, and is comfortable taking initiative and working independently.

You’ll be based in Irvine and work closely with an administrative team located across multiple offices. Because your manager is based in Northern California, proactive communication and collaboration with teammates in other locations will be important.

This role may be especially appealing to someone looking for meaningful part‑time work with a predictable but flexible schedule.

• Help keep the Irvine office organized, welcoming, stocked, and running smoothly.
• Provide day‑to‑day administrative support to team members.
• Coordinate meetings, lunches, office events, conference rooms, and meeting spaces.
• Order and maintain office and kitchen supplies.
• Receive and distribute mail and packages.
• Assist with document preparation, formatting, scanning, filing, and organization.
• Coordinate with vendors and building contacts.
• Support onboarding and welcoming new team members.
• Assist with travel arrangements, expense reports, and occasional company initiatives.
• Notice what needs attention, take initiative, and help solve day‑to‑day office needs.
• Collaborate with administrative teammates in other offices and provide support across the team when needed.
• Participate in occasional company and administrative team events, including a few offsite or weekend events each year.

We’re more interested in finding the right person for the team than in a specific number of years of experience.

The ideal candidate:

• Has 4+ years of administrative, office, customer service, hospitality, or similar experience.
• Is dependable, organized, and attentive to detail.
• Follows through and can manage several priorities at once.
• Works comfortably and independently without constant direction.
• Uses good judgment and knows when to…