Assistant Director - Decision Modelling, EY Parthenon

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Assistant Director - Decision Modelling – London

The opportunity

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.

The breadth of our work will give you exposure to transactions, bids, financing and project finance, as well as business planning, forecasting, complex contracts and tools used for ongoing decision-making. You will work directly with clients across varied assignments, building your specialist expertise and broader commercial judgement.

As a Decision Modelling Assistant Director, you will lead complex engagements at the heart of senior client decision-making. Working with Partners and senior clients, you will define the question, shape the support needed and steer a proportionate approach through to practical delivery and outcomes. You will combine deep financial modelling expertise with commercial judgement and senior client leadership, challenging established thinking, building trusted relationships and turning opportunities into successful work.

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

What we look for

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…