Principal Water Engineer

At Mott MacDonald, we are driven by purpose and powered by brilliant people. As a trusted engineering, management, and development consultancy, we work with clients to solve complex challenges and deliver sustainable outcomes that make a meaningful difference for the communities we serve.When you join us as an experienced professional, you will bring your expertise to work that matters while continuing to grow your career. You will collaborate with talented colleagues across disciplines and geographies, contribute your perspective, and help shape better outcomes through technical excellence, innovation, and integrity.Build on your experience while helping shape what comes next. At Mott MacDonald, you'll work alongside talented people on complex and rewarding projects that make a real difference. We value fresh perspectives, encourage collaboration, and provide opportunities to expand your skills, take on new challenges, and grow your career. Whether you're deepening your technical expertise, broadening your leadership experience, or exploring new opportunities across our business, you'll be supported by a team that is committed to helping you succeed.We are seeking a Principal Wastewater Engineer to help lead and grow our wastewater technical discipline across New York, New Jersey, Pennsylvania and Massachusetts. This senior role will combine client and account leadership with technical oversight and project delivery, focusing primarily on municipal wastewater treatment with additional involvement in collection, conveyance and pumping systems.The successful candidate will develop trusted relationships with municipal utilities and public agencies, identify and shape new opportunities, and lead strategic pursuits. This individual will also serve as a senior technical adviser, providing direction and quality oversight for complex wastewater treatment and infrastructure projects from planning through construction.Key responsibilities include: * Develop and implement growth strategies for priority wastewater clients and regional accounts. * Build trusted relationships with utility leaders, public agencies, plant operators and industry partners. * Identify upcoming needs, position the team for future opportunities and lead capture planning for strategic pursuits. * Lead proposals, client interviews, presentations, contract negotiations and account-development activities. * Serve as project director, project manager or principal-in-charge for major wastewater assignments. * Provide technical leadership for wastewater treatment planning, process evaluations, troubleshooting, NPDES permitting, facility design and plant upgrades. * Oversee the development of design criteria, process calculations, hydraulic profiles, mass balances, equipment sizing and facility layouts. * Guide evaluations and designs involving headworks, primary and biological treatment, nutrient removal, clarification, disinfection, biosolids treatment and handling, chemical feed systems, advanced treatment, wet weather treatment and ancillary systems. * Experience with sanitary sewer, force main, pump station, inflow and infiltration, wet-weather management and process-piping projects. * Direct multidisciplinary teams and oversee project scope, schedule, budget, quality, commercial performance and risk. * Support projects during bidding, construction, commissioning and start-up, including resolution of complex technical and operational issues. * Mentor project managers and technical staff while supporting succession planning and regional team development.The required technical foundation is modelled on experience spanning municipal and industrial wastewater, treatment process development, plant upgrades, advanced oxidation, membranes, intensification and innovative processes, sanitary and storm sewer design, and wastewater conveyance networks.We invite applications from candidates with the following experience: * Bachelor's