Six Sigma Black Belt - Tax Process Reinvention

Location: London

Other locations: Anywhere in Region

Date: Jul 2, 2026

Requisition ID: 1720107

The opportunity

EY’s Global Tax Centre of Excellence Data & AI team play a prominent role in leading client transformation initiatives that leverage Data & AI as core capabilities. The CoE seeks to architect reusable patterns and process blueprints to bootstrap scalability across all the EY Tax technology teams in all key markets.

You will have an existing opportunity to stay on the leading edge of technology development and to contribute to the successful transformation of EY tax and its clients.

Role Purpose

The Six Sigma Black Belt is a foundational role within the Tax Process Reinvention & Agentic AI CoE.

The role is responsible for deep task‑level decomposition of tax processes and data flows, identification and quantification of waste, and the design of Lean‑optimised To‑Be processes that are explicitly engineered to support agentic AI workflows.

This role ensures that AI is applied to the right work, in the right way, at the right time — and is not layered on top of broken or inefficient processes.

Key Responsibilities

Process Decomposition & Lean Analysis

• Decompose end‑to‑end tax processes to atomic task level, explicitly defining:
  • inputs and outputs
  • decision points
  • hand‑offs
  • exception paths
  • Produce Value Stream Maps (As‑Is and To‑Be) with quantified metrics (cycle time, lead time, takt time, capacity utilisation)
• Apply the 8 Wastes framework systematically to identify:
  • non‑value‑added activity
  • bottlenecks and delays
  • duplication and rework
• Quantify improvement opportunities to support:
  • business cases
  • prioritisation of agent candidates
  • phased transformation roadmaps

AI‑Ready Process Design

• Partner closely with the Data & AI Architect to:
  • identify tasks suitable for agent execution
  • define Human‑in‑the‑Loop control points
  • shape agent‑to‑agent and workflow‑to‑agent interactions
• standardised
• auditable
• scalable across jurisdictions and clients

CoE & Capability Development

• Act as process authority within the Tax Process Reinvention & Agentic AI CoE
• Develop reusable Lean artefacts and patterns for repeat client deliveryCoach client and EY teams on Lean‑led AI enablement

Required Experience & Background

• Certified Six Sigma Black Belt (or equivalent practical experience)
• Proven delivery of Lean transformations in complex, regulated environments
• Strong experience decomposing knowledge‑heavy processes (tax, finance, compliance, or adjacent domains)
• Comfortable working alongside technologists, data engineers, and AI specialists
• Experience presenting quantified improvement cases to senior stakeholders
• Strong interpersonal, workshop facilitation skills
• Prior work in Tax, Finance, or Professional Services
• Exposure to workflow platforms (e.g., ServiceNow) or platform‑based operating models
• Experience supporting automation or AI initiatives (even if not hands‑on)

Success Measures

• Quality and clarity of task‑level process decomposition
• Reduction in non‑value‑added work prior to automation
• Smooth hand‑off from Lean design to agent build
• Reuse of Lean artefacts across engagements

What we offer you

At EY, we’ll develop you with future‑focused skills and equip you with world‑class experiences. We’ll empower you in a flexible environment, and fuel you and your extraordinary talents in a diverse and inclusive culture of globally connected teams.

To help create an equitable and inclusive experience during the recruitment process, please inform us as soon as possible about any disability‑related adjustments or accommodations you may need.

Equal Opportunity Statement

EY is building a better working world by creating new value for clients, people, society and the planet, while building trust in capital markets.