Senior Process Mechanical Engineer

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Arcadis is the world's leading company delivering sustainable design, engineering, and consultancy solutions for natural and built assets.

We are more than 36,000 people, in over 70 countries, dedicated to improving quality of life. Everyone has an important role to play. With the power of many curious minds, together we can solve the world’s most complex challenges and deliver more impact together.

Our growing team in California is seeking an experienced Senior Process Mechanical Engineer to join our California Water Business. As part of this role, you will collaborate within a strong and supportive team environment to deliver innovative solutions for our clients. Arcadis serves a variety of municipal and private sector clients in many market sectors. We combine technical expertise, a passion to serve, and a willingness to be adaptable in every project to serve our clients.

You will bring your expertise to a variety of project types ranging from large municipal water/wastewater treatment facility upgrades projects to local system upgrades and feasibility studies. This role sits within our global Resilience global business area.

As a Senior Process Mechanical Engineer specializing in water and wastewater projects, you will play a pivotal role in leading innovative mechanical design and process integration for cutting‑edge treatment facilities, reservoirs, and pumping or lift stations. You will drive the development of comprehensive construction documents and detailed specifications for critical systems, including pumps, valves, gates, and other mechanical components. Your expertise will be central to establishing the basis of design, completing in‑depth calculations, and delivering robust solutions tailored to each project’s unique challenges.

You’ll perform thorough assessments, meticulously size and select equipment, develop and evaluate design options with accurate cost estimates, and prepare technical memoranda to clearly document your rationale and recommendations. By leading seamless coordination among various engineering disciplines, you’ll ensure every project benefits from a fully integrated design approach. You’ll develop process flow narratives, conduct hydraulic analyses, and play an active role in project management activities such as budget and schedule tracking.

Beyond engineering, you’ll support business development efforts, contribute to compelling proposals, and inspire the next generation by mentoring junior engineers and ensuring rigorous quality control reviews. This is an opportunity to make a lasting impact on vital water infrastructure projects while advancing your career in a collaborative, forward‑thinking environment.

Proficient in mechanical design standards and experience in design bid‑build or alternative delivery projects. Strong working knowledge of CAD and BIM and be proficient with Microsoft Office (Word, Excel, PowerPoint) and interpersonal, verbal, and written communication skills, strong work ethic and ability to multi‑task, prioritize, and take direction.

• B.S. in Civil or Mechanical Engineering (or related field) and 10 years of relevant experience in process mechanical engineering for water and wastewater facilities.
• Licensed Professional Engineer (P.E.) in the state of California.

• Mechanical or Civil P.E. preferred.
• 15+ years of relevant experience in process mechanical engineering for water and wastewater facilities.

We can only achieve our goals when everyone is empowered to be their best. We believe everyone's contribution matters. It’s why we are pioneering a skills‑based approach, where you can harness your unique experience and expertise to carve your career path and maximize the impact we can make together.

You’ll do meaningful work, and no matter what role, you’ll be helping to deliver sustainable solutions for a more prosperous planet. Make your mark, on your career, your colleagues, your clients, your life and the world around…