At a Glance
- Tasks: Lead Lean Six Sigma reviews and optimise tax processes using AI.
- Company: Join EY, a global leader in tax technology transformation.
- Benefits: Flexible work environment, world-class training, and diverse culture.
- Other info: Opportunity for career growth in a dynamic, inclusive team.
- Why this job: Shape the future of tax processes with cutting-edge AI and Lean methodologies.
- Qualifications: Certified Six Sigma Black Belt and experience in complex environments.
The predicted salary is between 63000 - 77000 £ per year.
Location: London, GB, SE1 2AF
Job Function: Tax Tech Transformation (TTT)
Employer: EY Global Services
Apply by: 2026-09-07
Company: EY
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 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
Lead Lean Six Sigma DMAIC reviews across Tax service lines (CIT, PAS, Indirect Tax, Transfer Pricing, WHT). 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).
- Waste Identification & Quantification
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
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 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
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 (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. Learn more.
Are you ready to shape your future with confidence? Apply today.
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.
EY | Building a better working world. EY is building a better working world by creating new value for clients, people, society and the planet, while building trust in capital markets. Enabled by data, AI and advanced technology, EY teams help clients shape the future with confidence and develop answers for the most pressing issues of today and tomorrow. EY teams work across a full spectrum of services in assurance, consulting, tax, strategy and transactions. Fueled by sector insights, a globally connected, multi-disciplinary network and diverse ecosystem partners, EY teams can provide services in more than 150 countries and territories.
Six Sigma Black Belt - Tax Process Reinvention in London employer: EY (Ernst & Young)
At EY, we pride ourselves on being an exceptional employer, offering a dynamic work culture that fosters professional growth and collaboration. Located in the heart of London, our team enjoys a flexible environment with access to world-class training and development opportunities, all while contributing to meaningful projects that shape the future. Join us to be part of a diverse and inclusive community dedicated to building a better working world.
StudySmarter Expert Advice🤫
We think this is how you could land Six Sigma Black Belt - Tax Process Reinvention in London
✨Tip Number 1: Get Involved in Consulting Case Competitions
Look for case competitions hosted by universities and consulting firms. They’re a fab way to showcase your problem-solving skills and meet industry players. Plus, winning one can seriously boost your CV, which we know is key when applying for roles like Six Sigma Black Belt - Tax Process Reinvention at EY (Ernst & Young)!
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We think you need these skills to ace Six Sigma Black Belt - Tax Process Reinvention in London
Some tips for your application 🫡
Show Your Problem-Solving Skills:In management consulting, it's all about problem-solving—so make sure your CV highlights your analytical and critical thinking skills. Include examples from your studies or previous roles where you tackled complex issues or came up with innovative solutions. Quantify your achievements whenever possible to demonstrate your impact!
Tailor Your Cover Letter:Your cover letter is your chance to explain why you're a perfect fit for the consulting world. Focus on your motivation for joining the industry and how your skills align with the requirements of the role at EY (Ernst & Young). Remember to mention any relevant coursework or projects that showcase your understanding of strategic frameworks or business models!
Highlight Team Experience:Consultants often work in teams, so it's vital to showcase your collaborative skills. Include experiences where you've worked effectively with others, whether in academic group projects or internships. Discuss your role in the team and how you helped achieve common goals, demonstrating you can thrive in a consultancy environment.
Professionalise Your Online Presence:Make sure your LinkedIn and any other professional profiles are up to date, reflecting your career aspirations in management consulting. Connect with industry professionals and follow relevant groups—show you’re serious about entering this field. Applying through our website is a great way to get noticed, so showcase your personality and enthusiasm there!
How to prepare for a job interview at EY (Ernst & Young)
✨Master the Case Study Game
In management consulting, case study interviews are all the rage. Make sure to practice structuring your thoughts and analysing data on the fly. Use resources like example case studies to get comfortable with frameworks and solutions. Remember, it’s not just about getting the right answer but showcasing your thought process, so talk us through your reasoning!
✨Know Your Numbers
Be prepared for some numerical and analytical questions. Brush up on your mental math and be ready to interpret data from charts or graphs. We might throw some business scenarios at you that require a quick turnaround on numerical analysis, so practice these skills to feel confident and swift!
✨Show Your Leadership Flair
As this is a full-time role, we want to see your potential as a seasoned consultant. Be ready to discuss experiences where you've led a project or a team. Think about times you've influenced decisions or navigated challenges—this is your chance to show how you can thrive in a fast-paced, collaborative environment.
✨Be a Cultural Fit
We’re not just looking for brains; we want to see if you vibe with our company culture at EY (Ernst & Young). Prepare to share how your values align with ours. Have a think about what makes a great team environment for you and how you can contribute to that. A good cultural fit goes a long way in management consulting!
