Senior Technical Assurance Engineer

Job title Senior Technical Assurance Engineer  Division Asset Operations & Capital Delivery Location Hybrid - Riverside (STW) Contract type Permanent Full/Part-time Full-time Salary Competitive salary between £50,000 to £65,000 per annum, depending on the skills and experience of successful candidates. Job grade B Closing date 05/03/2026

Senior Technical Assurance Engineer

Join Thames Water’s Major Projects Team – Shape the Future of Water and Wastewater Infrastructure.

Are you ready to take on one of the most exciting engineering challenges in the UK water sector?

We’re looking for aSenior Technical Assurance Engineer to join our Major Projects team, where you’ll play a pivotal role in delivering some of the most technically complex and high-profile projects in the UK’s largest potable water and wastewater treatment investment programmes.

With project values ranging from £30 million to over £200 million and covering the full delivery lifecycle from feasibility to asset takeover, this is your opportunity to make areal and lasting impact—on our customers, our environment, and the future of water and wastewater infrastructure.

What you’ll be doing as a Senior Technical Assurance Engineer

• Lead technical assurance across capital projects, ensuring delivery to time, cost, and quality.
• Contribute your skills and experience to positively shaping solutions that holistically balance innovation, value for money, risks, resilience and safety.
• Collaborate with contractors and consultants to ensure compliance with our
  technical, environmental, and regulatory standards
  .
• Ensure solutions meet the
  Project Brief
  , address stakeholder Needs and deliver best Whole Life Cost. buildable, operable and maintainable solutions.
• Ensuring consultants and contractors fulfil their CDM role such as Principal Designer, Designer and Principal Contractor duties.
• Provide the necessary Health and Safety information to the supply chain in accordance with CDM Regulations.
• Support the Project Manager to achieve governance on solution endorsement from internal stakeholders such as Engineering, Operations and Sponsor.
• Take on the lead to ensure all technical queries are responded to time.
• Assuring contractors and consultants provide the necessary evidence to demonstrate compliance with technical and construction requirements.
• Carry out technical audits / assessments (pre, during and post-construction) to ensure Environmental, Health and Safety and Quality issues are appropriately addressed on your projects.
• Ensure change is managed effectively to minimise cost and programme impacts and mitigate the risks to compliance, performance, health, safety, wellbeing or the environment.
• You will proactively protect and enhance Thames Water’s reputation with external customers and stakeholders.
• You’ll also enjoy an environment that encourages continuous improvement, customer‑focussed and collaborative culture across a range of technical and commercial disciplines, internal business functions, and with the supply community amongst a diverse range of external stakeholders.

Hybrid – Contract based in Riverside STW with travel to other sites. The successful candidate will be required to be on‑site for at least 3 days a week. 36 hours a week, Monday to Friday.

What you should bring to the role

• Hold a degree in civil/mechanical/process Engineering or possess equivalent experience in a relevant role within the water or wastewater sector. We also welcome candidates with transferable skills from other industries who bring strong technical expertise and a passion for engineering excellence.
• Have significant experience working in a technical or similar role with knowledge and previous involvement in delivering major complex projects across the project life cycle.
• Motivated in the effective communication of complex issues to simple messages to enable management decision that delivers Thames Water Needs, protect people, the environment and creating better outcomes for customers.
• Have detailed technical knowledge within your discipline plus experience of working across engineering disciplines and interfaces with other projects within the same site.
• Be commercially aware with a good…