Senior Internal Auditor

Overview

Lead high‑impact internal audits and risk assurance across Thames Water.

Key Responsibilities

• audit planning
• risk assessment
• control evaluation
• methodology development
• stakeholder management
• audit reporting

Tasks

You’ll be part of a collaborative and forward-thinking team, delivering audits that make a real difference—enhancing controls, improving processes, and supporting strategic decision-making. If you’re passionate about audit excellence and want to work in a role where your insights matter, we’d love to hear from you. As a Senior Internal Auditor, you’ll lead audits and assurance projects that strengthen Thames Water’s controls and risk management. You’ll drive best practices, support audit improvements, and build strong stakeholder relationships—enhancing the impact and visibility of the internal audit team. -Ensure audit findings are robust and meaningful, with risks clearly assessed and remediation timelines agreed with business owners. Maintain high standards of audit quality in line with internal policies and professional guidelines. -Lead and deliver impactful audits across compliance, financial, operational, programme, and technology areas—driving high-quality outcomes from planning through to final reporting. Collaborate with stakeholders at all levels, including Directors, to ensure findings are clear, risk-aligned, and actionable. -Offer ad hoc support on risk and control matters, acting as a trusted advisor to the business when needed. -Identify opportunities to enhance processes and controls, ensuring audits deliver real value and support cost-effective, efficient operations. -Stay ahead of industry best practices, bringing fresh thinking and innovative tools to enhance audit delivery and team performance. -Build strong relationships across the business, working closely with auditees and stakeholders to support action closure, share insights, and promote a culture of continuous improvement. -Support the Audit Manager in developing audit methodologies, tools, and reporting frameworks that strengthen the team’s effectiveness and consistency. -Provide expert advice and business insight, contributing to a high-performing audit function and offering practical solutions to risk and control challenges. -Collaborate across the Risk, Audit and Assurance team, helping to raise the profile of internal audit and drive improvements in risk management and governance.

Requirements

• internal audit
• stakeholder
• aca
• analytical
• thames water
• communication

What You Bring

Working at Thames Water -Extensive experience of internal audit -Confident communicator with the ability to influence without formal authority -Strong stakeholder engagement skills, with experience reporting to senior management -A relevant professional qualification (e.g. ACA, ACCA, CIMA, CMIIA, CIA) -Proven track record of delivering end-to-end audits, preferably including large infrastructure or asset-based projects -Analytical mindset with the ability to challenge and improve existing processes

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Benefits

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. Location– Hybrid, flexible working, Reading. 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. 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. -Annual Leave - 26 days holiday per year, increasing to 30 with the length of service. (Plus bank holidays) -Performance-related pay plan directly linked to company performance measures and targets -Competitive salary of £55,000 - £70,000 per annum, depending on experience. -Personal Medical Assessments – Open to all once a year. -Contributory pension – Defined Contribution - Maximum of 12% -2x employee contribution. -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.

About Thames Water

-Delivering clean water and wastewater services across London and the Thames Valley. -Operates a vast network of infrastructure to meet the needs of its customers. -Focusing on sustainable water solutions and addressing climate change challenges. -Key player in major infrastructure projects, including the Thames Tideway Tunnel. -Involved in energy production through renewable initiatives like hydropower. -Committed to improving water quality, reliability, and customer service.

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