Senior Executive (Manager) - Decision Modelling, EY Parthenon - London

At EY, we’re all in to shape your future with confidence.

We’ll help you succeed in a globally connected powerhouse of diverse teams and take your career wherever you want it to go.

Join EY and help to build a better working world.

Senior Executive – 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 Senior Executive, you will work at the heart of client decision-making, owning day-to-day delivery; from agreeing objectives to producing clear, usable outputs. Often working amid uncertainty, multiple stakeholders and varied data, you will exercise judgement over priorities and technical choices while supporting the engagement leader on wider delivery matters.   Your key responsibilities

Design, build, test and document financial models, analytical frameworks or decision‑support tools. Work collaboratively with clients to define the decision they face and understand how the outputs will be used, scoping the support they need and shaping the approach. Plan and manage the work, translating the agreed scope into a proportionate, practical approach and owning priorities, timing and budget. Help clients understand the implications, options and trade-offs relevant to their decision, using modelling and analytics to develop insights and identify risks and opportunities. Lead or facilitate day-to-day client meetings, gather and validate information, present findings and maintain alignment on requirements, progress and next steps. Deliver assignments independently with appropriate senior support or lead a small team, setting clear objectives, coaching junior colleagues and reviewing work thoroughly. Ensure appropriate quality review, resolve findings and identify material matters for senior review. Manage delivery governance, documentation and handover, helping clients understand and use the outputs, escalating matters requiring senior judgement. Obtain representative feedback and use it to set your development priorities, while providing timely, balanced feedback and coaching to others. Contribute to proposals, pitches and client opportunities, and support team initiatives that strengthen our capabilities, ways of working and market profile.

Skills and attributes for success What we look for

Relevant financial modelling experience, demonstrating Microsoft Excel proficiency, problem-solving, and disciplined testing and quality review. Judgement to compare modelling or analytical options and select an approach suited to the client’s requirements. Curiosity about how organisations work, with the financial and commercial judgement to identify key drivers and connect