Senior Assurer

Job title Senior Assurer  Division Finance & Commercial Location Hybrid - Clearwater Court - RG1 8DB
Contract type Permanent Full/Part-time Full-time Salary Competitive salary of up to £60,000 - £75,000 per annum, depending on your experience Job grade B Closing date 09/02/2026

As an Assurance Senior
, you’ll play a key role in delivering high‑quality assurance reviews across Thames Water, including reviews of externally reported data and information. Your work will help drive best practice, strengthen data integrity, and ensure accurate, reliable information reaches our stakeholders customers.

You’ll lead assurance reviews and projects
, contribute to the delivery of the assurance plan, and support continuous improvement of assurance approaches. Building strong relationships across the business will be central to your success, as you help raise the profile and impact of the internal audit function.

Joining our growing Internal Audit, Assurance and Controls team
, you’ll have the opportunity to shape new processes and frameworks, including the development of an assurance map and aligned assurance practices, and to support the evolution of our wider control framework. This is an exciting opportunity to make a tangible impact while helping to build a more robust, effective assurance environment across the organisation.

• Lead and support the execution of compliance, financial, operational, and programme assurance reviews to relevant standards and Thames Water methodology
• Build successful business relationships with auditees and other stakeholders in the business, including managing action closure and peer review. Identify and evaluate areas for potential improvement in processes and controls while ensuring that all work is efficient and cost effective
• Aid in the development and management of an assurance map, aligned assurance processes across Thames Water, and developing and maintaining management information
• Stay abreast of leading assurance practices and tools to maximise the effectiveness and efficiency of the Thames Water assurance team

• Experience in audit and assurance, or equivalent of internal audit and risk experience. Other relevant business experience may also be considered (for example experience from working within a regulator).
• Experience of delivering end-to-end assurance reviews and audits within complicated organisations
• Ability to assess and suggest improvement to processes across diverse groups and business units
• Objectivity and ability to challenge norms and standard operating processes
• Strong analytical and problem-solving abilities
• Degree qualified with relevant qualification i.e. ACA / ACCA / CIMA / CMIIA / CIA
• Experience of delivering end-to-end assurance reviews or audits including large infrastructure/asset projects and programmes
• Experience of completing assurance work in the water industry or a similar regulated industry
• Experienced in the production and development of assurance maps
• Experienced in the production and development of aligned assurance processes, and frameworks

An opportunity to join a company that offers its employees a rewarding career path, allowing individuals to reach their full potential. This is an exciting time to join Thames Water as we continue to deliver our innovative turnaround plan.

• Competitive salary of up to £60,000 - £75,000 per annum, depending on your experience.
• Annual Leave - 26 days holiday per year, increasing to 30 with the length of service. (Plus bank holidays)
• Performance-related pay is directly linked to company performance measures and targets.
• Generous Pension Scheme through AON.
• Personal Medical Assessments – Open to all once a year.
• 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.

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.