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 a Senior 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 a real 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…