Six Sigma Black Belt Tax Process Reinvention

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The opportunity

EYs 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 tasklevel decomposition of tax processes and data flows identification and quantification of waste and the design of Lean optimised ToBe 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

• Lead Lean Six Sigma DMAIC reviews across Tax service lines (CIT PAS Indirect Tax Transfer Pricing WHT)
• Decompose endtoend tax processes to atomic task level explicitly defining:
  • inputs and outputs
  • decision points
  • handoffs
  • exception paths
  • Produce Value Stream Maps (AsIs and ToBe) with quantified metrics (cycle time lead time takt time capacity utilisation)

Waste Identification & Quantification

• Apply the 8 Wastes framework systematically to identify:
  • nonvalueadded activity
  • bottlenecks and delays
  • duplication and rework
• Quantify improvement opportunities to support:
  • business cases
  • prioritisation of agent candidates
  • phased transformation roadmaps

AIReady Process Design

• Partner closely with the Data & AI Architect to:
  • identify tasks suitable for agent execution
  • define Humaninthe Loop control points
  • shape agenttoagent and workflowtoagent interactions
• Ensure future state processes are:
  • 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 delivery
• Coach client and EY teams on Leanled 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

Desirable Experience

• Prior work in Tax Finance or Professional Services
• Exposure to workflow platforms (e.g. Service Now) or platform based operating models
• Experience supporting automation or AI initiatives (even if not handson)

Success Measures

• Quality and clarity of tasklevel process decomposition
• Reduction in nonvalueadded work prior to automation
• Smooth handoff from Lean design to agent build
• Reuse of Lean artefacts across engagements

What we offer you

At EYwelldevelop you with future-focused skills and equip you with world-class you in a flexible environment and fuel you and your extraordinary talents in a diverse and inclusive culture of globally connected teams. Learnmore.

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