EY
Six Sigma Black Belt - Tax Process Reinvention
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Six Sigma Black Belt - Tax Process Reinvention
Six Sigma Black Belt – Tax Process Reinvention & Agentic AI CoE
At EY, we’re all in to shape your future with confidence.
We’ll help you succeed in a globally connected powerhouse of diverse teams and take your career wherever you want it to go.
Join EY and help to build a better working world.
The Opportunity
EY’s Global Tax Centre of Excellence Data & AI team plays 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 EY Tax technology teams in all key markets.
You will have the chance to:
- Stay on the leading edge of technology development
- Contribute to the successful transformation of EY tax and its clients
- Ensure AI is applied to the right work, in the right way, at the right time—never layered on top of broken processes
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-Behind (To-Be) processes explicitly engineered to support agentic AI workflows
- Ensuring that AI is applied efficiently and effectively
Key Responsibilities
Process Decomposition & Lean Analysis
- Lead Lean Six Sigma DMAIC reviews across Tax service lines (e.g., Corporation Tax CIT, Property Accounting and Services PAS, Indirect Tax, Transfer Pricing, Withholding Tax WHT)
- Decompose end-to-end tax processes to an atomic task level, explicitly defining:
- Inputs and outputs
- Decision points
- Hand-offs
- Exception paths
- Produce Value Stream Maps (current-state As-Is and target-state To-Be), including quantified metrics:
- Cycle time
- Lead time
- Takt time
- Capacity utilisation
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Waste Identification & Quantification
- Apply the 8 Wastes framework to identify:
- Non-value-added activity
- Bottlenecks and delays
- Duplication and rework
- Quantify improvement opportunities to support:
- Business case development
- Prioritisation of AI 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 (HITL) control points
- Shape agent-to-agent and workflow-to-agent interactions
- Ensure future-state processes are:
- Standardised
- Auditable
- Scalable across jurisdictions and clients
CoE & Capability Development
- Act as the 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 Lean-led AI enablement
Required Experience & Background
☑ A certified Six Sigma Black Belt (or equivalent practical experience) ☑ Proven delivery of Lean transformations in complex, regulated environments ☑ Strong experience decomposing knowledge-heavy processes (e.g., 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 and workshop facilitation skills
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Desirable Experience
✨ 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 (hands-on preferred but not mandatory).
Success Measures
Leveraging your impact through:
- 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 grow your career with future-focused skills, global experiences, and the resources to excel in a diverse and inclusive environment.
- Future-focused skill development
- Flexible work environment
- World-class mentorship and growth opportunities
- Collaborative, globally connected teams
Are you ready to shape your future with confidence? Apply today.
EY | Building a better working world
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Enabled by the power of data, AI, and advanced technology, our teams help clients:
- Shape their future with confidence
- Address today’s most pressing challenges
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