EY
Six Sigma Black Belt - Tax Process Reinvention
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Six Sigma Black Belt - Tax Process Reinvention
EY – Six Sigma Black Belt (Data & AI in Tax CoE)
We’re all in to shape your future with confidence. At EY, we’ll help you succeed in a globally connected powerhouse of diverse teams, taking your career wherever you want it to go.
Join EY and help build a better working world.
The Opportunity
EY’s Global Tax Centre of Excellence Data & AI team play a pivotal role in advancing client transformation initiatives by integrating Data & AI as core capabilities. The Centre of Excellence (CoE) aims to create reusable process blueprints and architecture patterns to deliver scalable solutions across all Tax technology teams in critical markets.
This role gives you the opportunity to:
- Stay at the forefront of technology development.
- Contribute directly to the transformation of EY’s tax and client offerings.
Role Purpose
As Six Sigma Black Belt, you will be responsible for:
- Deep task-level decomposition of tax processes and data flows.
- Identification and quantification of waste.
- Design of Lean-optimised To-Be processes explicitly built to support agentic AI workflows.
This role ensures that AI is leveraged at the optimal time and work, scaling efficiency with the right approach.
Key Responsibilities
1. Process Decomposition & Lean Analysis
- Lead DMAIC-driven Lean Six Sigma reviews across key tax service lines (CIT, PAS, Indirect Tax, Transfer Pricing, WHT).
- Break down end-to-end tax processes into atomic-level tasks, defining:
- Inputs and outputs.
- Decision points.
- Hand-offs.
- Exception paths.
- Create Value Stream Maps (As-Is and To-Be) with quantified metrics:
- Cycle time.
- Lead time.
- Takt time.
- Capacity utilisation.
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2. Waste Identification & Quantification
- Apply the 8 Wastes framework to:
- Pinpoint non-value-added activities.
- Identify bottlenecks and delays.
- Locate duplication and rework.
- Quantify opportunities to support:
- Business case development.
- Prioritisation of AI agent candidates.
- phased transformation roadmaps.
3. AI-Ready Process Design
- Collaborate closely with Data & AI Architects to:
- Identify tasks best suited for agent execution.
- Define Human-in-the-Loop control points.
- Design agent-to-agent and workflow-to-agent interactions.
- Ensure future-state processes are:
- Standardised.
- Audit-ready.
- Scalable across jurisdictions and client bases.
4. CoE & Capability Development
- Act as process authority within Tax Process Reinvention & Agentic AI CoE.
- Develop reusable Lean artefacts for repeat client engagements.
- Coach EY and client teams on Lean-led AI-enabled transformations.
Required Experience & Background
- Certified Six Sigma Black Belt (or equivalent practical experience).
- Delivered Lean transformations in complex, regulated environments.
- Strong ability to break down knowledge-heavy processes (tax, finance, compliance, or similar).
- Comfortable collaborating with technologists, data engineers, and AI specialists.
- Experience presenting quantified improvement cases to senior stakeholders.
- Strong interpersonal and workshop facilitation skills.
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Desirable Experience
- Prior work in Tax, Finance, or Professional Services.
- Exposure to workflow platforms (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 before automation.
- Smooth transition from Lean design to agent build.
- Reuse of Lean artefacts across engagements.
What We Offer You
At EY, you’ll:
- Develop future-focused skills through world-class experiences.
- Thrive in a flexible, inclusive environment.
- Growth in diverse, globally connected teams.
Learn more on our careers page.
Accommodation Notice
To ensure an inclusive recruitment process, please let EY know immediately of any disability-related adjustments you may require.
EY | Building a better working world.
EY empowers clients through elite expertise in assurance, consulting, tax, strategy, and transactions, spanning more than 150 countries—equipped by data, AI, and advanced technology. EY teams deliver forward-looking solutions, helping clients tackle today’s most urgent challenges.
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