Principal Mechanical Design Engineer

Company: Thames Water Utilities Limited
Apply for the Principal Mechanical Design Engineer
Location: Reading
Job Description:

Job title Principal Mechanical Design Engineer Ref 42570 Division Asset Operations & Capital Delivery Location Hybrid – Clearwater Court – RG1 8DB Contract type Permanent Full/Part-time Full-time Salary Offering between £65,000 to £80,000 per annum, depending on the skills and experience of the successful candidate, plus a £5,800 car allowance. Job grade C Closing date 01/06/2026

Lead the Future of Water Engineering – Become Our Principal Mechanical Design Engineer

Are you ready to shape the future of water and wastewater infrastructure? As our Principal Mechanical Design Engineer, you’ll take the lead in driving innovation, setting engineering standards, and mentoring a talented team of professionals. This is more than a technical role — it’s a strategic opportunity to become the ‘Intelligent Client’ at the heart of our AMP8 ambitions and beyond.

What you’ll be doing as a Principal Mechanical Design Engineer

  • Set precise technical requirements with Project Definition Briefs for strong project foundations.
  • Refine Technical Asset Standards to enhance process efficiency and effectiveness.
  • Uphold engineering standards in Mechanical Engineering to optimise asset performance.
  • Lead the development of innovative designs for the water and wastewater sectors.
  • Inspire teams on mechanically focused projects, driving meaningful change.
  • Achieve technical sign-off and assurance for seamless project handover.
  • Support the advancement of innovative technologies through research.

Location

Hybrid – Clearwater Court, Reading

Working Pattern

36 hours a week.

What you should bring to the role

To thrive in this role, the essential criteria you’ll need are:

  • Be degree qualified or equivalent in mechanical engineering with a charter through a relevant awarding body.
  • A Mechanical Engineering background in one or more sludge digestion and treatment, biogas and CHP systems, water and wastewater treatment, pumps/piping systems, or process equipment is essential.
  • Understand the regulatory environment to comply with our engineering regulatory requirements.
  • Had exposure to lead design engineering roles.

Additional skills and experiences would be excellent to have/bring

  • Previous experience in the water industry.

What’s in it for you?

  • Offering between £65,000 to £80,000 per annum, depending on the skills and experience of the successful candidate, plus a £5,800 car allowance.
  • 26 days holiday per year, increasing to 30 with the length of service. (plus bank holidays)
  • Annual Bonus.
  • Performance-related pay plan directly linked to company performance measures and targets.
  • Private Medical Health Care.
  • Access to lots of benefits to help you take care of your and your family’s health and well‑being, and your finances – from annual health MOTs and access to physiotherapy and counselling to Cycle to Work schemes, shopping vouchers and life assurance.

EEO and Accessibility

We’re committed to being a great, diverse, and inclusive place to work. We welcome applications from everyone and want to ensure you feel supported throughout the recruitment process. If you need any adjustments, whether that’s extra time, accessible formats, or anything else, just let us know. We’re here to help and support.

Disclaimer

Due to the high volume of applications we receive, we may close the advert earlier than the advertised date, so we encourage you to apply as soon as possible to avoid disappointment.

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Posted: May 25th, 2026