Principal​/Associate Process Engineer

Manchester, United Kingdom / London, United Kingdom / Glasgow, United Kingdom / Cambridge, United Kingdom / Leeds, United Kingdom / Reading, United Kingdom / Croydon, United Kingdom / Brighton, United Kingdom / Cardiff, United Kingdom / Edinburgh, United Kingdom

Mott Mac Donald is a global engineering, management, and development consultancy with over 20,000 employees across more than 50 countries and 140+ offices.

We work across incredible global industries, delivering exciting work that is defining our future and making an important societal impact in the communities we serve. Our people power our performance – we succeed when they do. With countless opportunities to collaborate, learn, and grow, the possibilities for excellence are as varied as every individual.

Whether you want to grow as a subject matter expert or broaden your experience with roles across our international community, you’re surrounded by global specialists who want to combine their expertise and champion you to be your best. As a proudly employee‑owned business, we benefit our clients, our communities, and each other, investing in creating the right space for everyone to feel empowered, included, and valued.

Whatever your ambition, Mott Mac Donald is where people come to be brilliant.

The Water Utilities Division is Mott Mac Donald’s centre of excellence for responding to the UK and Ireland's water and wastewater challenges. The work we do is at the forefront of ensuring safe water supplies for future generations, preventing urban flooding, and improving the health of our rivers and coastal environments. Our multi‑disciplinary teams provide a variety of services throughout the full project life cycle, from advisory services and feasibility studies to outline and detailed design.

Together, we deliver best‑in‑class solutions to our clients while offering diverse and technically stimulating opportunities to our people.

We have an exciting opportunity for a talented Principal/Associate Process Engineer to join our team to support the delivery of our UK and Ireland clients’ water programmes.

Key responsibilities and duties include:

• Lead process engineering input across feasibility, concept, preliminary, and detailed design for water treatment designs
• Develop and review process designs, including block flow diagrams, P&IDs, mass balances, and equipment sizing
• Analyse operational data to identify optimisation opportunities and improve treatment performance
• Perform process modelling and simulation to support design and operational enhancements
• Prepare high‑quality technical reports, proposals, and client presentations
• Check process deliverables for accuracy and compliance
• Engage with clients and stakeholders to ensure successful project delivery
• Mentor and support junior engineers, fostering technical growth and team development
• Collaborate with resource coordinators to manage project resources and contribute to recruitment and training initiatives
• Support business development by providing technical input to proposals, tenders, and client strategies

We are looking for an individual, keen to make a difference in the sector, take wide responsibilities and progress professionally.

• Degree in Chemical Engineering or related engineering field
• Chartered Status (CEng) with a recognised Professional Institution
• Proven experience in municipal water treatment
• Strong understanding of conventional and emerging treatment technologies
• Significant experience in developing and delivering feasibility, outline, and detailed process designs
• Demonstrated ability to conduct root‑cause analysis and optimise treatment processes
• Excellent technical report writing skills using concise English
• Excellent communication skills for client interaction and team collaboration
• Skilled in reviewing technical deliverables, calculations, and reports
• Commitment to continuous professional development and staying abreast of emerging technologies
• Willingness to contribute to technical knowledge networks and promote best practice

Mott Mac Donald Ltd. are not currently offering sponsorship to candidates under the Skilled Worker visa route in the…