Principal Process Design Engineer - UK Wide

MWH Treatment Limited; United Kingdom; Hybrid; GBP 90,000 - 130,000; Full time

Job summary

MWH Treatment Limited seeks a Principal Process Design Engineer to lead innovative water and wastewater process solutions across UK projects. You will guide multidisciplinary teams, drive technical governance, and mentor engineers while ensuring safety, quality and compliance.

This role offers flexible working within the UK, with a strong emphasis on delivering sustainable, commercially sound treatment designs and supporting major bids.

Qualifications

• Degree qualified in Chemical Engineering, Process Engineering, Environmental Engineering or a related discipline.
• Significant UK water and wastewater sector experience delivering process engineering solutions.
• Experience leading multidisciplinary engineering design projects.
• Ability to develop innovative, cost-effective treatment solutions to meet client/regulatory requirements.
• Experience producing and reviewing process calculations, hydraulic assessments, PFDs, P&IDs and technical specs.
• Strong understanding of related disciplines and excellent stakeholder management.

Responsibilities

• Lead the development and delivery of complex process engineering solutions for water and wastewater projects.
• Provide technical leadership across multidisciplinary teams and guide design governance.
• Develop robust process solutions from concept through detailed design.
• Mentor engineers and contribute to growth of technical capability.
• Identify and manage technical risks, ensuring quality, safety and compliance.
• Support major bids and contribute to delivery strategies.

Skills

Technical leadership

Stakeholder management

Problem solving

Communication

Mentoring

Education

Degree in Chemical/Process/Environmental Engineering

CEng status or working towards chartership

Job description

We are looking to strengthen our engineering team with a Principal Process Design Engineer based at a suitable location within the UK, with flexible working available.

Drive Innovation in Water Treatment

At MWH Treatment, we're looking for an experienced Principal Process Design Engineer to lead the development of innovative and sustainable process solutions across some of the UK's most significant water and wastewater infrastructure projects.

This is an outstanding opportunity for a proven process engineering professional to provide technical leadership, influence project strategy, support major bids and mentor engineering teams. You'll play a pivotal role in delivering efficient, compliant and commercially sound treatment solutions that help meet the growing demands of the water industry.

As a recognised technical authority, you will guide multidisciplinary teams, solve complex engineering challenges and ensure process designs are delivered to the highest standards of quality, safety and performance.

The Role

As a Principal Process Design Engineer, you will provide authoritative technical leadership across a portfolio of projects, ensuring treatment processes are designed to deliver optimum operational, environmental and commercial outcomes.

Working closely with Discipline Leads, Chief Engineers, Project Managers, clients and construction teams, you will develop robust process solutions from concept through to detailed design while maintaining excellence in technical governance and quality assurance.

Key Responsibilities

• Lead the development and delivery of complex process engineering solutions for water and wastewater treatment projects.
• Provide technical leadership and guidance across multidisciplinary engineering teams.
• Develop innovative, practical and risk-balanced treatment process solutions.
• Ensure designs are safe, sustainable, compliant and operationally efficient.
• Produce and review process calculations, mass balances, process flow diagrams (PFDs), P&IDs, technical reports and design documentation.
• Optimise treatment processes to achieve regulatory compliance, operational performance and whole-life cost efficiency.
• Support major project bids and contribute to successful project delivery strategies.
• Act as a technical reviewer and maintain high standards of engineering governance and quality assurance.
• Manage technical delivery from broad project briefs, balancing programme, cost, quality and resource requirements.
• Identify and manage technical risks, ensuring issues are proactively addressed.
• Work collaboratively with clients, regulators, operational teams, contractors and suppliers to deliver successful project outcomes.
• Mentor and develop engineers, supporting the growth of technical capability across the business.
• Promote a culture of continuous improvement, innovation, safety and customer focus

You'll be an experienced Process Design Engineer with a strong understanding of water and wastewater treatment technologies and a proven ability to lead complex engineering projects.EssentialDegree qualified in Chemical Engineering, Process Engineering, Environmental Engineering or a related discipline.Significant experience delivering process engineering solutions within the UK water and wastewater sector.Strong understanding of water and sewage treatment principles, technologies and operations.Experience leading multidisciplinary engineering design projects.Ability to develop innovative and cost-effective treatment solutions to meet client and regulatory requirements.Experience producing and reviewing process calculations, hydraulic assessments, process flow diagrams and technical specifications.Good understanding of related engineering disciplines including civil, mechanical, electrical and ICA engineering.Strong technical judgement and problem-solving abilities.Excellent communication and stakeholder management skills, with the ability to present technical proposals clearly and confidently.Proven ability to manage multiple priorities while ensuring quality and programme commitments are achieved.Commitment to health and safety, quality and engineering excellence.DesirableChartered Engineer (CEng) status or working towards chartership.Experience acting as a technical reviewer, approver or signatory.Strong knowledge of UK water industry regulations, standards and treatment technologies.Experience mentoring or managing engineering teams.Established professional network within the water sector.Experience across both clean water and wastewater treatment projects.

Why Join MWH Treatment?

Work on major water and wastewater infrastructure projects that have a direct impact on communities and the environment.

Lead the development of innovative treatment solutions and technical best practice.

Influence key engineering decisions across complex programmes of work.

Collaborate with highly skilled multidisciplinary teams.

Enjoy genuine opportunities for career progression, professional development and technical leadership.

Be part of a business committed to sustainability, innovation, quality and safety.

Join UsIf you're an experienced Process Design Engineer looking for a senior technical leadership role where you can shape the future of water and wastewater treatment, we'd love to hear from you.Join MWH Treatment and help deliver innovative process solutions that protect the environment, support communities and ensure the sustainable management of the UK's water resources.