Assistant Director - Decision Modelling - London

At EY-Parthenon, our unique combination of transformative strategy, transactions, tax and corporate finance delivers real-world value – solutions that work in practice, not just on paper. Benefiting from EY’s full spectrum of services, we’ve reimagined strategic consulting to work in a world of increasing complexity. With deep functional and sector expertise, paired with innovative AI-powered technology and an investor mindset, we partner with CEOs, boards, private equity and governments every step of the way.

Competitive business depends on intelligent, informed decisions. As part of our experienced Decision Modelling team, you will help shape complex strategic, commercial and financial decisions for major corporates, private equity firms, other investment institutions, government departments and public sector bodies. You will use financial modelling, analysis and structured problem-solving to turn complexity into clear, practical insight that clients can act on.

Your key responsibilities:

• Lead engagements across the full lifecycle, including scoping the work, shaping the design and directing delivery, providing appropriate challenge throughout.
• Co-develop complex solutions with clients, lead senior relationships and ensure the modelling work informs wider commercial and strategic decisions.
• Actively manage engagement quality, risk, scope and economics throughout the lifecycle.
• Identify and develop new opportunities, build relevant internal and external networks and help shape new business and offerings.
• Lead and coach engagement teams to deliver high-quality work.
• Help develop future leaders, role-model inclusive leadership behaviours, support wellbeing and contribute to career development and recruitment.
• Help shape and improve our Decision Modelling services, tools and ways of working.
• Evaluate and lead safe, effective uses of AI across projects, workflows or services, enabling teams to apply approved tools responsibly and improve productivity, quality, decision-making and client value.

Skills and attributes for success:

• Deep financial modelling expertise, including the judgement to scope, challenge and assure complex work and the ability to undertake or direct complex analysis.
• Well-developed commercial instinct, with an understanding of how organisations work and the relationship-building skills to identify and develop or convert opportunities through client, internal or external relationships.
• Experience leading projects to resolve complex or poorly defined business problems.
• The ability to build consensus with senior stakeholders, adapt your style, constructively challenge assumptions and bring fresh perspective and meaningful business insight.
• Success in structuring engagements or resolving conflicts amid competing objectives, sensitivities or risks.
• Effective management of engagement scope, resources, economics, quality and risk, with governance and clear oversight of the evidence needed to support key decisions and approvals.
• The flexibility to integrate specialist input and reconcile differing disciplines to deliver coherent client solutions.
• Effective team leadership and people development, using your interpersonal awareness and clear communication to understand individual needs, set expectations, give honest feedback and create appropriate stretch.
• A strong sense of accountability for initiatives taken on and for delivery of genuine, lasting benefit.

Ideally, you’ll also have:

• ACA, ACCA or another relevant finance qualification; a numerate or analytical degree; or relevant professional experience.
• Experience using complementary tools such as Power Query, Power BI, VBA or other data and visualisation platforms to improve delivery and inform decision-making.
• Confidence working with large or less structured datasets, including source-system extracts, and guiding teams on proportionate approaches to data handling.
• Experience guiding teams or stakeholders in the responsible adoption of AI-enabled tools, including validation of outputs for accuracy, relevance and potential bias, protection of confidentiality and appropriate human review.
• Experience contributing to account, sector or proposition development beyond individual engagements.
• Depth of expertise in a specialist modelling area or industry sector, with experience applying it across engagements.

At EY, you will be part of a global network working on high-profile projects. The role provides opportunities to work with clients and colleagues across the UK and internationally. You will join a collaborative team that brings together colleagues with varied professional backgrounds and experience, where people are encouraged to ask questions, contribute ideas and challenge assumptions constructively. You will contribute from the outset, broaden your experience and grow your influence as a modelling specialist whose advice clients trust.

The role requires UK travel and occasional international travel, depending on client needs and business priorities. EY supports hybrid and flexible working and provides reasonable adjustments throughout recruitment and employment where required.