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United Kingdom, Central Services, Hattersley, North Division, Northern Ireland, Belfast, Scotland, Stepps, Severn Trent Water, Coleshill, Derby, United Utilities
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  • Principal Mechanical Design Engineer - North Division

About The Role

We are looking to strengthen our engineering team with a Principal Mechanical Design Engineer Based at a suitable location within our Northern Region with flexible working available. 

Engineer the Future of Water Infrastructure

At MWH Treatment, we're looking for an experienced Principal Mechanical Design Engineer to provide technical leadership across some of the UK's most critical water and wastewater infrastructure projects.

This is a fantastic opportunity for a proven mechanical engineering professional to take ownership of complex design solutions, influence project delivery strategies, support major bids, and mentor engineering teams. You'll play a key role in delivering safe, innovative and commercially effective mechanical designs that support the UK's essential water infrastructure.

As a recognised technical authority, you'll lead the development and assurance of mechanical engineering designs while driving quality, sustainability and engineering excellence across the business.

The Role

As a Principal Mechanical Design Engineer, you will provide authoritative technical leadership across a range of water and wastewater projects, ensuring designs are safe, compliant, buildable and cost effective.

Working closely with Discipline Leads, Chief Engineers, Project Managers, construction teams, clients and suppliers, you will transform complex engineering challenges into practical, high-quality solutions while maintaining the highest standards of technical governance and quality assurance.

Key responsibilities will include:

  • Lead and coordinate the delivery of complex mechanical engineering designs within the water and wastewater sector.
  • Provide technical leadership and guidance across multidisciplinary engineering teams.
  • Develop innovative, practical and risk-balanced engineering solutions.
  • Ensure all designs are safe, sustainable, compliant, buildable and commercially effective.
  • Produce, review and approve mechanical design calculations, specifications, reports, drawings and technical documentation.
  • 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 escalated and resolved effectively.
  • Liaise with clients, contractors, suppliers and key stakeholders to deliver successful project outcomes.
  • Support and mentor engineers, helping to strengthen technical capability across the business.
  • Promote a culture of continuous improvement, innovation, safety and customer focus.

About You

You'll be an experienced Mechanical Design Engineer with strong leadership capabilities and a proven track record of delivering complex engineering solutions within the water industry.

Essential

  • Degree qualified in Mechanical Engineering (BEng, MEng or equivalent).
  • Significant experience delivering mechanical engineering designs within the UK water and wastewater sector.
  • Strong understanding of water and sewage treatment processes and associated mechanical systems.
  • Experience leading multidisciplinary engineering design projects.
  • Knowledge of pumping systems, pipework design, valves, treatment process equipment, sludge handling systems and associated mechanical infrastructure.
  • Ability to develop practical, efficient and economical engineering designs and plant layouts.
  • Good understanding of related engineering disciplines including civil, electrical, process engineering and project management.
  • Strong technical judgement and problem-solving abilities.
  • Excellent communication skills with the ability to present technical proposals clearly, confidently and convincingly.
  • Proven ability to manage competing priorities and deliver quality outcomes to programme.
  • Commitment to health and safety, quality and engineering excellence.

Desirable

  • Chartered Engineer (CEng) status.
  • Experience acting as a technical reviewer, approver or signatory.
  • Experience managing, mentoring or developing engineering teams.
  • Strong understanding of relevant industry standards, specifications and regulations.
  • Established professional network within the UK water sector.
  • Experience delivering designs for treatment works, pumping stations and associated infrastructure projects.

Why Join MWH Treatment?

  • Work on nationally significant water and wastewater infrastructure projects.
  • Influence key technical decisions across major programmes of work.
  • Lead and develop talented engineering teams.
  • Collaborate with highly experienced multidisciplinary professionals.
  • Be part of a business committed to innovation, sustainability, safety and engineering excellence.
  • Enjoy excellent opportunities for professional development and career progression.

Join Us

If you're an experienced Mechanical Design Engineer looking to step into a senior technical leadership role where you can drive innovation, influence project success and help shape the future of water infrastructure, we'd love to hear from you.

Join MWH Treatment and play a leading role in delivering the vital infrastructure that supports communities and protects the environment across the UK.

About Us

MWH Treatment is an integrated design and build provider working in the water sector. With over 1400 staff working across eight regional centres, supporting six long-term water sector frameworks and two recently won frameworks, operating both as a sole contractor but also in joint ventures and alliances. 

At MWH Treatment we believe that people matter. We know to build successful, creative teams we need a diverse workforce that can deliver innovative ways of thinking. We provide an environment where you will have the freedom to develop and grow to your full potential, creating opportunity by inviting, embracing, and celebrating difference, our goal as an employer is to motivate, and develop our employees. By fostering a diverse range of talents and perspectives we ensure we have the breadth of viewpoints, experiences, and skills needed to succeed. Embracing diversity of all kinds enables us to provide a work environment and culture that plays a key role in attracting and retaining the right people with the right skills. 

As signatories to the Armed Forces Corporate Covenant, we have made a promise to support our forces, working with the CTP to help ex veterans find work in the civilian world. We also support Mates in Mind, a charitable programme to improve and promote positive mental health in the workplace. We don’t just tick boxes; we live these values every day. 

What MWH offer 

Packages include -  

A competitive salary 

Hybrid Working (Jobs needs dependent) 

Car/car allowance (Jobs needs dependent) 

25 days holiday + Bank Holidays (with an additional 5 days available to buy) 

Contribution Pension scheme 

Life Assurance 

Health Insurance 

Private Medical Insurance 

And many more benefits including – cycle to work scheme, discounts and savings Hub, Kids Pass etc 
Apply

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