Assistant Director – Decision Modelling, EY Parthenon – London

Overview

As an Assistant Director in EY-Parthenon’s Decision Modelling team, you guide complex strategic and financial decisions for major corporates, private equity, and public bodies. You combine advanced financial modelling with commercial judgment to shape solutions that influence high-stakes outcomes. You’ll lead engagements, mentor teams, and collaborate with senior clients to turn insights into actionable decisions. The role blends finance, strategy, and AI-enabled tools to drive client value at scale.

Pay / Benefits

• hybrid and flexible working
• travel opportunities (UK and international)
• global network of 25,000+ people
• inclusivity and wellbeing emphasis
• development and mentorship
• adjustments in recruitment and employment as needed

Responsibilities

• Lead engagements across the full lifecycle: scoping, design, and delivery with appropriate challenge
• Co-develop complex client solutions and manage senior relationships to inform wider decisions
• Actively manage engagement quality, risk, scope, and economics throughout the lifecycle
• Identify and develop new opportunities, build internal and external networks, shape new offerings
• Lead and coach engagement teams to deliver high-quality work
• Support development of future leaders, model inclusive leadership, wellbeing, and recruitment
• Shape and improve Decision Modelling services, tools, and ways of working
• Evaluate and lead responsible AI use across projects to improve productivity and client value

Key requirements

• Deep financial modelling expertise with ability to scope and challenge complex work
• Strong commercial instinct and relationship-building skills for opportunity development
• Experience leading projects to resolve complex, poorly defined problems
• Ability to build consensus with senior stakeholders and challenge assumptions
• Proven governance, risk, scope, and resource management across engagements
• Capacity to integrate specialist inputs and deliver coherent client solutions
• Strong leadership and people development, with clear communication and accountability
• Experience with AI-enabled tools adoption and validation of outputs

• Communication
• Collaborative mindset
• Strategic thinking
• Power Query
• Power BI
• VBA

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