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Principal Mechanical Design Engineer

Job in Brynna, Bridgend County, CF72, Wales, UK
Listing for: RSE
Full Time position
Listed on 2026-07-31
Job specializations:
  • Engineering
    Environmental Engineer, Mechanical Engineer
Salary/Wage Range or Industry Benchmark: 70000 - 95000 GBP Yearly GBP 70000.00 95000.00 YEAR
Job Description & How to Apply Below

What Are We Looking For?

Please make sure you read the following details carefully before making any applications.

Owing to continued sustainable growth, our Chemical Dosing and Wastewater Solutions team is looking for a Principal Mechanical Design Engineer to join us on a permanent basis, and work as part of our in-house, multidisciplinary design team. You will take on a key role in all aspects of projects from scoping and detailed design right through to implementation, ensuring compliance with Client Specifications and current regulatory standards, with a strong focus low on carbon solutions.

Some

Of Your Key Duties Include
  • Meeting with clients to discuss specific intervention requirements.
  • Leading the planning and implementation of projects in association with our Delivery Management teams.
  • Providing technical guidance on Mechanical matters to the wider project team and Senior Management.
  • Line management and development of mechanical engineers within your team
  • Taking the lead on the development of Mechanical design deliverables by you and your team.
  • Mentoring, identifying and developing the next generation of Mechanical Engineering talent.
  • Ensuring compliance with Client specification and current regulatory and industry standards.
What Do You Need?
  • Degree/HND/HNC in Mechanical Engineering or equivalent.
  • Chartered engineer with a relevant professional body is preferrable.
  • Mechanical design engineering experience within municipal water/wastewater treatment sector.
  • Design management/lead experience.
  • Programme/financial management experience.
  • Experience of working at all design stages, from optioneering/FEED through to construction support and As-Built is highly desirable.
  • Possess the ability to work on multiple projects consecutively.
  • Full UK Driving Licence
Who Are We?

RSE is a trusted clean water technology company, developing market leading products and solutions for purifying drinking water, recycling wastewater and cleaning water in industrial processes. We are disrupting the water sector, delivering water treatment products, technologies, and services to clients across the UK. RSE provides offsite modular build solutions using a low-carbon approach compared to traditional construction methods and our unique offering to the market focuses on innovation, efficiency, and excellence.

Established in 1982, RSE has grown into one of the most prominent MEICA engineering businesses in the UK water industry. We have created a complete in-house and full-service capability from project inception through to design, fabrication, and delivery by means of installation and commissioning. We additionally have one of the largest servicing and maintenance teams in the market, to ensure we’re on hand for all our clients’ needs.

Our service offering presents industry-leading innovative solutions and our dedicated staff play a key role in delivering our sustainability and wider business goals. With over 2000 staff across our group of companies, our strategic ambition will see the business continue to grow as we expand our operations and diversify our products. One of RSE’s key focuses is driving servant leadership and giving our people the opportunity and responsibility to take an entrepreneurial approach in their career development.

What

RSE Offer
  • Industry leading salary
  • Company car allowance
  • A flexible career development path, with no restrictions on where your career can go
  • Holiday Allowance of 31 days per year, rising to 33 days per year after 2 years’ service
  • Holiday Buy / Sell Scheme
  • Company Pension Scheme
  • Car allowance
  • Cycle to Work
  • Discounted National Gym Membership
  • Professional Fees Paid
  • Employee Discount Platform
  • EV/Hybrid Car Lease Scheme
  • Access to our network of health professionals including mental health champions and occupational health nurse

In a flourishing sector where there are vast career opportunities available, we believe by leading transformation in the industry our offering to the market means our people have the space to thrive.

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