Senior Internal Auditor (In-House) in London

Forvis Mazars is a leading global professional services network providing audit & assurance, tax, and advisory services. Forvis Mazars in the UK spans 14 offices across the nation and has over 3,400 professionals, with 190 partners. We have a clear purpose and a shared commitment to shape a better future. You will join a collaborative and inclusive team where you are supported to grow your skills, explore new opportunities, and contribute from day one. You will work with a diverse client base, develop meaningful connections, and gain experience that extends beyond your local team.

Our Business Services Team (BST) is a collective of creative, strategic, forward-thinking business enablers. Together the People & Culture, Marketing & Communications, IT, Operations, Finance and Quality & Risk Management teams make it their mission to ensure Forvis Mazars has the right tools, technology, strategies and services in place to deliver exceptional client service and future-proof our growing business.

The Internal Audit team plays a critical role in safeguarding the firm’s assets, ensuring robust internal controls, and supporting risk management across a high-profile, complex, and highly regulated organisation. We operate in a dynamic environment, providing independent assurance and insight to senior leadership and governance bodies. Our work spans financial, strategic, operational, and compliance audits, and we are instrumental in helping the firm meet its regulatory obligations and strategic objectives.

As a Senior Internal Auditor, you will play a pivotal role in driving Forvis Mazars’ strategic priorities by delivering high-impact internal audit assurance and advisory reviews. You will assess the adequacy and effectiveness of controls in place to mitigate key business risks and priorities, evaluate compliance with regulations, and provide insight that supports continuous improvement across the firm. In addition to core audit delivery, you may also contribute to the function’s ambition of positioning Internal Audit as a trusted advisor within the business.

This internal facing role will principally involve working with the Head of Internal Audit, Senior Internal Audit Manager and Manager, service lines and different functions across the BST. This role demands a high level of curiosity, initiative, and critical thinking. You will be expected to go beyond the checklist, proactively identifying key and emerging risks, evaluating controls, and recommending practical, forward-looking solutions. Equally important is your ability to manage relationships professionally throughout the internal audit process: setting clear expectations, maintaining regular communication, and anticipating issues to ensure the delivery of high-quality, timely insights.

You will be joining the Internal Audit team at an exciting point in our journey. Building on the progress of recent years, we’re evolving into a more strategic, insight-driven function—broadening our influence, deepening our advisory role, and strengthening our visibility across the firm. You will also contribute to the development of audit methodologies and play a key role in shaping the Internal Audit function’s visibility and influence across the business.

Role & Responsibilities:

• Leading and delivering high-quality, complex, risk-based internal audits from planning to reporting, ensuring high-quality outcomes aligned with the Internal Audit Manual and professional internal auditing standards.
• Developing clear, risk-focused scopes within ‘terms of reference' in collaboration with auditees, ensuring alignment and buy-in before fieldwork begins.
• Managing internal audits to agreed timelines and budgets, proactively addressing risks to delivery and escalating where needed.
• Building trusted relationships with auditees and stakeholders, ensuring clear communication, managing expectations, and addressing issues early.
• Providing advice and support during internal audits and beyond—helping teams strengthen controls, navigate change, and improve processes.
• Conducting closing meetings and presenting findings with confidence and clarity to gain agreement from senior stakeholders.
• Demonstrating intellectual curiosity by exploring root causes, identifying systemic issues, and proposing innovative solutions.
• Drafting insightful, well-structured reports that go beyond compliance and add strategic value.
• Following up on agreed actions to ensure recommendations are implemented and risks are addressed.
• Support the monitoring and reporting of key performance indicators (KPIs) and assist in drafting papers that incorporate metrics and performance insights to our reporting fora such as the Audit and Risk Committee.
• Supervision and coaching Internal Auditors, providing constructive feedback and fostering a culture of learning and excellence.
• Supporting the development and refinement of internal audit methodologies, tools, and templates.
• Contributing to the annual internal audit planning process, bringing fresh perspectives and challenge.
• Championing continuous improvement and knowledge sharing within the team and wider business.

Skills, Knowledge & Experience:

• Experience in internal audit or within a compliance/risk assurance environment and working as part of a broader assurance framework.
• Knowledge of the Global Internal Audit Standards (GIAS).
• Relevant Qualifications are preferred, but not essential, such as IIA, ACA, ACCA.
• Strong understanding of risk management principles and control frameworks.
• Demonstrated ability to think critically, ask the right questions, and connect the dots.
• Experience working with senior stakeholders and handling sensitive or confidential matters with discretion.
• Experience supervising or mentoring others, with a collaborative and supportive approach.
• Commercial awareness and the ability to tailor recommendations to the business context.
• Excellent communication skills, both written and verbal, with the ability to influence and engage stakeholders at all levels.
• Proactive mindset with a passion for continuous improvement, both in your own development and in driving positive change across the business.
• Strong data literacy, including the ability to interrogate and interpret data using Excel or other tools.
• Ability to work independently, manage competing priorities, and deliver under pressure.
• Developing a network of contacts across Forvis Mazars and contributing to cross-functional initiatives.

Diversity, Equity & Inclusion:

At Forvis Mazars diversity, equity and inclusion are central to our values. We value our people’s unique backgrounds, perspectives, and experience, and know this diversity creates better outcomes for our clients. We seek to attract, develop, and retain the best talent, inclusive of sex, ethnicity, disability, socio-economic background, sexual orientation, gender identity, nationality, and faith. We select candidates based on skills, knowledge, qualifications, and experience and aim to support all our team members to reach their potential. At Forvis Mazars, we promote an environment in which you can grow your skills, belong to a team that values your ideas, and make an impact that matters.