Senior Mechanical Engineer in London

Join Thames Water and help shape the future of our infrastructure. As a Senior Mechanical Engineer, you will lead the delivery of high-impact capital projects and play a central role in transforming and modernising sewage treatment works across the Thames Valley. This is your opportunity to make a meaningful impact. You will champion engineering excellence, sustainability, and safety, ensuring every project meets our highest standards while contributing to long-term improvements across our network.

What you’ll be doing as a Senior Mechanical Engineer:

• Deliver high-quality technical outcomes from Project Definition Briefs, maximising value through strong risk understanding and mitigation.
• Contribute to and continually enhance our Technical Asset Standards.
• Provide design sign-off between Asset Management and Capital Delivery in line with delivery stream requirements.
• Offer technical assurance throughout delivery, commissioning, and handover stages.

Working Location: Hybrid – based at Clearwater Court, with 2–3 days per week expected onsite or in the office.

Working Hours: 36 hours per week, Monday to Friday.

What you should bring to the role:

• HNC, HND, or Degree within Mechanical Engineering.
• Strong understanding of developing technical project solutions and briefs within your specialist field.
• Experience of project delivery within process-industry environments.
• Solid knowledge of health & safety requirements within the construction sector.
• Understanding of industrial processes relevant to mechanical engineering.

What’s in it for you?

• Competitive salary from £55,000 to £65,000 per annum.
• Annual Leave – 26 days holiday per year, increasing to 30 with the length of service (plus bank holidays).
• Access to many benefits to help you take care of your health 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.
• Performance-related pay plan directly linked to company performance measures and targets.
• Generous Pension Scheme through AON.

Thames Water is the UK’s largest water and wastewater company, with more than 16 million customers relying on us every day to supply water for their taps and toilets. We want to build a better future for all, helping our customers, communities, people, and the planet to thrive. It’s a big job and we’ve got a long way to go, so we need help from passionate and skilled people, committed to making a difference and getting us to where we want to be in the years and decades to come.

Thames Water is a unique, rewarding, and diverse place to work, where every day you can make a difference, yet no day is the same. As part of our family, you’ll enjoy meaningful career opportunities, flexible working arrangements and excellent benefits.

If you’re looking for a sustainable and successful career where you can make a daily difference to millions of people’s lives while helping to protect the world of water for future generations, we’ll be here to support you every step of the way. Together, we can build a better future for our customers, our region, and our planet.

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.

When a crisis happens, we all rally around to support our customers. As part of Team Thames, you’ll have the opportunity to sign up to support our customers on the frontline as an ambassador. Full training will be given for what is undoubtedly an incredibly rewarding experience. It’s also a great opportunity to learn more about our business and meet colleagues.

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.