Principal Mechanical Engineer

About Mott Mac Donald

Mott Mac Donald is a global engineering, management and development consultancy. Our purpose is to improve society by considering social outcomes in everything we do, relentlessly focusing on excellence and digital innovation, transforming our clients’ businesses, our communities and employee opportunities. A fundamental part of this is respecting each person’s differences and striving to meet their needs. Our values: progress, respect, integrity, drive, excellence.

We believe that because we care about what we do, we do things better. We know that our people are our most valuable asset, so we are dedicated to investing in them, through our comprehensive training and development schemes, exposure to the wider design and build business and endless opportunities. We are committed to creating a workplace where our people are safe, have a voice, can reach their full potential, and everyone shares in the rewards.

You’ll have the opportunity to contribute to projects that benefit our communities – from helping to secure water supplies for future generations to protecting homes and businesses from flood risk – our projects make a real difference.

A Mott Mac Donald Bentley we welcome applications from all sectors of the community. We are dedicated to building a diverse workplace where everyone feels included, has the opportunity to thrive, and is treated with respect. Even if you don’t meet every requirement for this role but are excited about the opportunity, we encourage you to apply. Find out more about our approach to Diversity, Equity & Inclusion here:  We are committed to ensuring that our recruitment practices are barrier-free and as inclusive as possible.

This includes making adjustments during the job application process and throughout your future career with us. Please call or email  to discuss any such adjustments that we can make. You can read more about our Equal Opportunities Policy here:
Equality, diversity and inclusion.

We are committed to providing a flexible and agile working environment that supports both our employees and the needs of the business. Mott Mac Donald Bentley is a fully integrated design and build business combining the design expertise of Mott Mac Donald with the contracting experience of JN Bentley to deliver award winning projects. Working for Mott Mac Donald Bentley, you will work on major water and wastewater schemes throughout all phases of the project from feasibility through to construction.

With an annual turnover surpassing £500 million, Mott Macdonald Bentley cements its position as a leader within the industry. The sustained, robust business performance creates an ideal environment for career growth.

In November 2023, MMB secured its first ever framework with South West Water, the company responsible for the water and wastewater services of 1.8 million customers in Cornwall, Devon, the Isles of Scilly and parts of Dorset and Somerset. The multi-million-pound AMP8 contract runs for five years to 2029, with the potential for a further five-year extension, and sees us bring our track record of innovative project delivery to the south-west of England for the very first time.

We’ve got a great opportunity to be innovative and creative in these new projects to deliver affordable solutions. We’re already on site supporting the completion of an existing project and we’re due to land new projects on site in 2025 as we continue to demonstrate to our client just what MMB is all about.

As a Principal Mechanical Engineer, you'll work on projects that make a real difference to our environment and our communities, enhancing the efficiency and effectiveness of water and wastewater treatment systems. You will play a pivotal role in shaping the mechanical functions throughout the lifecycle of various projects. From concept design to commissioning, you will ensure that all mechanical aspects are meticulously considered and integrated.

• Lead and oversee the design, planning, and execution of mechanical engineering on projects
• Provide design support and guidance for schemes and ensure all…