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Principal Mechanical Engineer

Job in Bristol, Bristol County, BS1, England, UK
Listing for: Mott MacDonald
Full Time position
Listed on 2026-09-09
Job specializations:
  • Engineering
    Environmental Engineer, Mechanical Engineer, Civil Engineering
Job Description & How to Apply Below
Internal applicants are welcome

Mott Mac Donald Bentley have been named a capital delivery partner on two multi-million-pound ‘lots’ that will see the company deliver projects across the region through to 2030 - with the potential for a five-year extension into AMP9 thereafter.     Wessex Water serves 2.9 million customers with water and sewerage services across the southwest of England. Set for record investment in AMP8 – more than double that of AMP7 – MMB will bring its strong track record of innovation and direct-delivery to drive a programme of work.

We will be delivering schemes located around Bournemouth, Poole and South Dorset area.  As a Principal Mechanical Engineer, you will contribute to projects that significantly impact our environment and communities. Working primarily in the UK water market, MMB provides the feasibility, design, construction, and commissioning services needed to keep water flowing and wastewater treated. You’ll work on projects that make a real difference to our environment and our communities by 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. The role of a Principal Mechanical Engineer includes:
Lead and oversee the design, planning, and execution of the mechanical engineering aspects of our projects. Provide technical expertise and guidance to our mechanical engineers and project teams. Develop knowledge and excellence within the team. Mentor and develop junior engineers and team members. Lead the development of the mechanical design of water and wastewater infrastructure and non-infrastructure projects through the project lifecycle encompassing P&IDs, valve schedules, pumps, tanks, process equipment, above ground pipework, lifting and access steelwork Coordinate with the wider design team of Electrical, Civil, Geotech and Process engineers.

Work closely with the project teams to ensure applications of client’s asset standards and engage in particular technical discussions on best practice and standards waivers. Working closely and collaboratively with the commercial, operational and construction teams to develop efficient, practical and safe solutions throughout design stages, construction and beyond Positively engage with the client, managing relationships and adopting a one-team approach to supporting them in achieving their aims.

What you’ll need:

Chartered Mechanical Engineer or above Degree in Mechanical Engineering, or related field Strong knowledge of the water and/or wastewater industry Strong knowledge of mechanical engineering principles, practices, and standards relating to process industries. Excellent communication, leadership, and problem-solving skills. Proven ability to manage multiple design tasks and meet deadlines.

What’s in it for you:

    Financial wellbeing   MMB match employee pension contributions between 4.5% and 7%.   As an independently owned business we share the financial success of the business with all our colleagues including our annual bonus schemes.   Payment of annual professional institution subscription costs   Health and wellbeing   A minimum of 33 days holiday each year, inclusive of public holidays, with the ability to buy, sell or carry over annual leave through our flexible benefits programme.  

Access to Life Assurance / Private Medical Insurance / Critical Illness Insurance and Health Screening options   We are happy to talk openly about flexible working and how we can support your responsibilities beyond the workplace.   Join a wide range of groups including our Advanced Employee Networks which support our LGBTQ+, gender, race and ethnicity, disability, and parents/carers communities.   Enhanced family and carers leave   Enhanced family leave policies, including 26 weeks paid maternity and adoption leave, and two weeks paid paternity/partner leave plus the option for shared parental leave.  

Up to 2 paid additional days leave are provided for those with significant caring responsibilities   Learning and development   MMB are committed to empowering our people to grow…
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