EY
Six Sigma Black Belt - Tax Process Reinvention
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Tax Process Reinvention & Agentic AI Six Sigma Black Belt – EY Global Tax Centre of Excellence
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The Opportunity
EY’s Global Tax Centre of Excellence Data & AI team plays a pivotal role in leading client transformation initiatives that leverage Data & AI as core capabilities. The Centre of Excellence (CoE) seeks to architect reusable patterns and process blueprints to accelerate scalability across all EY Tax technology teams globally.
You’ll have the opportunity to stay at the forefront of technology development and contribute to the successful transformation of EY Tax and its clients.
Role Purpose
The Six Sigma Black Belt holds a foundational position 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 inefficiencies (waste) to redesign lean, AI-optimised workflows.
- Ensuring agentic AI is applied effectively—improving the right work, in the right way, at the right time—rather than being overlaid onto broken processes.
Key Responsibilities
1. Process Decomposition & Lean Analysis
- Lead Lean Six Sigma DMAIC reviews across key Tax service lines (CIT, PAS, Indirect Tax, Transfer Pricing, Withholding Tax).
- Break down end-to-end tax processes to an atomic task level, defining:
- Inputs and outputs.
- Decision points.
- Hand-offs between teams.
- Exception paths and escalation flows.
- Produce 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
- Systematically apply the Eight Wastes framework to uncover:
- Non-value-adding activity.
- Bottlenecks and delays in workflows.
- Duplication and rework.
- Quantify potential improvements to support:
- Business case development.
- Prioritisation of AI candidate processes.
- Phased transformation roadmaps.
3. AI-Ready Process Design
- Collaborate with Data & AI Architects to:
- Identify tasks suitable for agent execution.
- Define Human-in-the-Loop (HITL) control points.
- Shape interactions between agent-to-agent and workflow-to-agent workflows.
- Ensure future-state processes are:
- Standardised for consistency.
- Auditable for compliance.
- Scalable across multiple jurisdictions and clients.
4. Centre of Excellence & Capability Development
- Serve as the process authority within the Tax Process Reinvention & Agentic AI CoE.
- Develop reusable Lean artefacts and process templates for repeat client engagement.
- Coach internal and client teams on Lean-led AI enablement strategies.
Required Experience & Background
- Certified Six Sigma Black Belt (or equivalent practical expertise in Lean transformations).
- Demonstrated experience delivering Lean transformations in complex, regulated industries.
- Proven track record decomposing knowledge-heavy processes (Tax, Finance, Compliance, or related domains).
- Comfortable working alongside technologists, data engineers, and AI specialists.
- Experience presenting quantified improvement cases to senior stakeholders.
- Strong interpersonal skills and workshop facilitation abilities.
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Desirable Experience
- Prior experience in Tax, Finance, or Professional Services.
- Familiarity with workflow platforms (e.g., ServiceNow) and platform-based operating models.
- Exposure to automation or AI initiatives (even if not hands-on delivery).
Success Measures
- Clarity and depth of task-level process decomposition.
- Measured reduction in non-value-added work prior to automation.
- Smooth transition from Lean design to AI agent implementation.
- Reusability of Lean artefacts across multiple engagements.
What We Offer You
At EY, we commit to developing your future-focused skills and delivering you world-class experiences. You’ll thrive in a flexible, inclusive culture where global teams empower each other’s talents:
- Confidence-building in roles that matter.
- Cutting-edge AI and data-driven opportunities.
- A fair and transparent workplace fundamenting growth.
Ready to shape your future with confidence?
Apply today—your next step starts here.
Equitable Access Statement
To ensure an inclusive recruitment process, please inform us immediately of any disability-related adjustments or accommodations you may require.
EY | Building a better working world
EY’s mission is to create lasting value for clients, people, society, and the planet while building trust in capital markets. Fuelled by data, AI, and advanced technology, EY helps clients navigate today’s challenges and future-proof their businesses.
with over 330,000 people spanning 150+ countries and territories, EY’s multidisciplinary teams deliver integrated services across:
- Assurance
- Consulting
- Tax
- Strategy & Transactions
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