Senior Mechanical Engineer

Join Us as a Senior Technical Assurance Engineer – Shape the Future of Water and Wastewater Infrastructure. Are you ready to make a lasting impact on communities and the environment? As a Senior Technical Assurance Engineer at Thames Water, you’ll be at the forefront of transforming and modernising our sewage treatment works. Your expertise will drive the delivery of innovative, cost-effective, and resilient engineering solutions that protect public health, preserve ecosystems, and support sustainable growth.

In this pivotal role, you’ll collaborate closely with contractors and multidisciplinary teams to ensure designs meet our rigorous technical standards and quality benchmarks. You’ll be empowered to lead projects that matter—bringing engineering excellence to life while contributing to a cleaner, greener future.

What you’ll be doing:

• Collaborate with diverse internal stakeholders, including engineers, asset management, and operations to shape fit-for-purpose solutions and positively influence innovation, value for money, and resilience.
• Collaborate with and provide assurance for consultants and contractors who support the delivery of often large and complex capital projects.
• Ensure compliance with legislation, regulations, policies, standards, and expectations so that solutions are delivered safely and meet the technical and environmental requirements of the Project Brief.
• Actively support Thames Water’s ‘triple zero’ Health, Safety, and well-being vision by auditing and reviewing Risk Assessments, Method Statements, and Safe Systems of Work to help achieve zero incidents, zero harm, and zero compromise.
• Identify and support the management of delivery risks and opportunities.
• Contribute to the creation of Project Briefs and respond to RFIs.

Work pattern: Hybrid – Clearwater Court with travel to Oxford Sewage Treatment Works. The successful candidate will be required to be on-site for 2 to 3 days a week. 36 hours a week, Monday to Friday; we are open to part-time and full-time hours.

What you should bring to the role:

• Be educated to a degree level in Mechanical Engineering.
• Background in working in a design and construction-related role.
• Awareness of applying the Construction (Design and Management) Regulations 2015 (CDM 2015).

Nice-to-haves:

• Technical knowledge and expertise of pumping systems, mechanical package plant, and the ability to work with various engineering disciplines to create fully operational solutions.

What’s in it for you?

• Competitive salary from £55,000 to £65,000 per annum, depending on skills and experience.
• 26 days holiday per year, increasing to 30 with length of service (Plus bank holidays).
• Generous Pension Scheme through AON.
• Benefits to support health, wellbeing, and finances – including annual health MOTs, access to physiotherapy and counselling, Cycle to Work schemes, shopping vouchers, and life assurance.
• Performance-related pay plan directly linked to company performance measures and targets.

Who are we? We’re 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.

Working at Thames Water: 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. Real purpose, real support, real opportunities. Come and join the Thames Water family.

Inclusive hiring and accommodations: 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.