Principal Membrane Bioreactor Process Engineer

Brown and Caldwell (BC) is seeking a Principal Membrane Bioreactor Process Engineer to serve as technical leader in Membrane Bioreactor (MBR) and advanced membrane treatment systems for our municipal wastewater, industrial wastewater, and reuse technical practices. The successful candidate will serve as a Subject Matter Specialist in MBR process engineering, providing strategic technical leadership, driving innovation solutions, developing talent, and supporting business growth across BC.

Who You Are

• A recognized expert in membrane system engineering, with deep technical expertise in MBR design, optimization, and operations, along with familiarity in RO / NF / UF / MF membrane technologies.
• A strong collaborative leader who consistently provides technical strategy, cross-functional teaming, coaching, and communication.
• A strategic thinker with experience in business development, problem solving, innovation, and talent development.
• Equally comfortable guiding internal teams and advising external clients with confidence, humility, and pragmatic solutions.
• Someone who thrives at the intersection of technical excellence, client engagement, and strategic practice leadership.

What You Will Do

Technical Leadership – MBR & Membrane Systems

Project Delivery Quality & Efficiency

Client Development & Sales

Knowledge Management & Standards

Talent Development

BC Brand & Industry Leadership

Desired Skills & Experience

Salary Range :   The anticipated starting pay range for this position is based on the employee’s primary work location and may be more or less depending upon skills, experience, and education. These ranges may be modified in the future.

Location A : $170,000 - $200,000

Location B : $185,000 - $215,000

Location C : $200,000 - $230,000

You can view which BC location applies to you If you have any questions, please speak with your Recruiter.

Benefits and Other Compensation : We provide a comprehensive benefits package that promotes employee health, performance, and success which includes medical, dental, vision, short and long-term disability, life insurance, an employee assistance program, paid time off and parental leave, paid holidays, 401(k) retirement savings plan with employer match, performance-based bonus eligibility, employee referral bonuses, tuition reimbursement, pet insurance and long-term care insurance. Click to see our full list of benefits.

About Brown and Caldwell

Headquartered in Walnut Creek, California, Brown and Caldwell is a full-service environmental engineering and construction services firm with 50 offices and over 2,100 professionals across North America and the Pacific. For more than 75 years, we have created leading-edge environmental solutions for municipalities, private industry, and government agencies. We strive to be the company of choice—to our clients, who benefit from our passion for delivering exceptional quality, and to our employees, present and future, who share our commitment to client service, collaboration, and innovation. Join us, and you will find a home where you can do your best work, reach new levels of expertise, and enjoy exceptional development opportunities. For more information, visit

This position is subject to a pre-employment background check and a pre-employment drug test.

Notice to Third Party Agencies : Brown and Caldwell does not accept unsolicited resumes from recruiters or employment agencies. In the event a recruiter or agency submits a resume or candidate without a previously signed agreement and approved engagement request with Brown and Caldwell, Brown and Caldwell reserves the right to pursue and hire those candidate(s) without any financial obligation to the recruiter or agency.

Brown and Caldwell is proud to be an EEO / AAP Employer. Brown and Caldwell encourages protected veterans, individuals with disabilities, and applicants from all backgrounds to apply. Brown and Caldwell ensures nondiscrimination in all programs and activities in accordance with Title VI of the Civil Rights Act.