Principal Process Design Engineer - UK Wide

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