Senior Data Scientist - Tax Technology Transformation

Ernst & Young LLP ( EY India ); Bengaluru; On-site; INR 2,800,000 - 6,000,000; Full time

Job summary

Ernst & Young LLP ( EY India ) is seeking a Senior Data Scientist to drive Tax Technology Transformation (TTT) within EY GDS IST. You’ll apply machine learning to generate actionable insights and build end-to-end models in Python, handling structured and unstructured data.

The role emphasizes collaboration with tax teams and business users to deliver scalable AI/ML solutions. You will design Generative AI-enabled tools, fine-tune LLMs, and implement robust production systems while mentoring

Qualifications

• Master’s degree in Statistics/Mathematics or related field.
• 5+ years of experience in ML/AI with 3+ hands-on work.
• Strong proficiency in Python and ML/AI techniques.
• Exposure to cloud (Azure, AWS) is a plus.
• Experience delivering end-to-end ML projects to production.

Responsibilities

• Apply ML techniques to deliver actionable insights.
• Own end-to-end model development in Python, including data exploration, feature engineering, training, validation and scoring.
• Design and build systems that mine massive datasets for ML use.
• Collaborate with business users to translate requirements into AI/ML solutions.
• Mentor team members and manage stakeholders in ML/AI best practices.
• Design Generative AI–enabled solutions, APIs and intelligent interfaces; integrate with GenAI platforms.
• LLM fine-tuning and evaluation for production including prompt templates and cost/time considerations.

Skills

Python

ML/AI techniques

NLP/NLG

LLM technologies

Generative AI

Prompt engineering

Data analysis

Production-grade systems

Cloud experience

Education

Master’s degree in Statistics/Mathematics

Bachelors / Master’s degree in Science/Engineering / MCA

Job description

TTT - Data Science - Senior At EY, you’ll have the chance to build a career as unique as you are, with the global scale, support, inclusive culture and technology to become the best version of you. And we’re counting on your unique voice and perspective to help EY become even better, too. Join us and build an exceptional experience for yourself, and a better working world for all.

TAX TECHNOLOGY TRANSFORMATION – Data Science -Senior EY GDS’s Tax Innovation, Solutions and Technology (IST) group as well as the Tax Tech Transformation (TTT) team’s mission is to develop, implement and integrate technology solutions that better serve our clients and engagement teams. As a member of EY’s core Tax practice, you’ll develop a deep tax technical knowledge and outstanding database, data analytics and programming skills. Ever-increasing regulations require tax departments to gather, organize and analyse more data than ever before. Often the data necessary to satisfy these ever-increasing and complex regulations must be collected from a variety of systems and departments throughout an organization. Effectively and efficiently handling the variety and volume of data is often extremely challenging and time consuming for a company.

The opportunity EY's GDS IST and TTT team members work side‑by‑side with the firm’s partners, clients and tax technical subject matter experts to develop and incorporate technology solutions that enhance value‑add, improve efficiencies and enable our clients with disruptive and market leading tools supporting Tax. GDS IST and TTT team works closely with clients and professionals in the following areas: Federal Business Tax Services, Partnership Compliance, Corporate Compliance, Indirect Tax Services, Human Capital, and Internal Tax Services. GDS Tax Technology provides solution architecture, application development, testing and maintenance support to the global TAX service line both on a pro‑active basis and in response to specific requests.

EY is currently seeking Senior to join our Tax Technology practice.

Your key responsibilities

Apply machine learning techniques to deliver actionable insights Own end‑to‑end model development in Python, including data exploration, feature engineering, training, validation, and scoring on structured and unstructured data Design and build systems that mine massive datasets and structure/ engineer it to be usable for machine learning models and to apply AI/Machine Learning technology to solve real‑world problems Apply standard statistical methods, simulation models and statistical programming as needed Collaborate closely with business users and analysts to translate requirements into AI/ML solutions and present outcomes clearly Manage stakeholders and mentor team members in Machine Learning, AI, and best practices Design and implement Generative AI–enabled solutions such as AI agents, APIs, and intelligent interfaces, integrating with enterprise GenAI platforms (Azure OpenAI / Azure AI Foundry) Hands‑on experience in LLM fine tuning and optimization, including parameter efficient tuning techniques and systematic evaluation of model quality, latency, and cost in production environments Strong expertise in production grade prompt and GenAI system design, including prompt templating, chaining, RAG pipelines, guardrails, and reliability patterns for scalable enterprise deployments

Skills and attributes for success

An overall experience of 5 + years of which 3+ years of hands‑on work experience in Machine Learning and Artificial Intelligence Strong hands‑on experience with ML/AI techniques including regression, decision trees, random forests, classification, clustering, NLP/NLG, deep learning, neural networks, and ARIMA Proven experience delivering end‑to‑end ML projects from development to production Expert proficiency in Python, with strong programming, algorithmic, and database skills Strong understanding of Generative AI and LLM technologies, including prompt engineering and enterprise LLM integration

To qualify for the role

you must have Master’s degree in Statistics/Mathematics from a reputed college OR Bachelors / Master’s degree in Science/ Engineering / MCA. Hands‑on involvement across the design, development, testing, and deployment of AI/ML solutions Tax application experience Ideally, you’ll also have Exposure to cloud (Azure, AWS) would be good to have. Strong verbal and written communication skills.

What we look for

A Team of people with commercial acumen, technical experience and enthusiasm to learn new things in this fast‑moving environment An opportunity to be a part of market‑leading, multi‑disciplinary team of 1400 + professionals, in the only integrated global transaction business worldwide. Opportunities to work with EY TAS practices globally with leading businesses across a range of industries

What we offer

EY Global Delivery Services (GDS) is a dynamic and truly global delivery network. We work across six locations – Argentina, China, India, the Philippines, Poland and the UK – and with teams from all EY service lines, geographies and sectors, playing a vital role in the delivery of the EY growth strategy. From accountants to coders to advisory consultants, we offer a wide variety of fulfilling career opportunities that span all business disciplines. In GDS, you will collaborate with EY teams on exciting projects and work with well‑known brands from across the globe. We’ll introduce you to an ever‑expanding ecosystem of people, learning, skills and insights that will stay with you throughout your career. Continuous learning: You’ll develop the mindset and skills to navigate whatever comes next. Success as defined by you: We’ll provide the tools and flexibility, so you can make a meaningful impact, your way. Transformative leadership: We’ll give you the insights, coaching and confidence to be the leader the world needs. Diverse and inclusive culture: You’ll be embraced for who you are and empowered to use your voice to help others find theirs.

EY | Building a better working world EY exists to build a better working world, helping to create long‑term value for clients, people and society and build trust in the capital markets. Enabled by data and technology, diverse EY teams in over 150 countries provide trust through assurance and help clients grow, transform and operate. Working across assurance, consulting, law, strategy, tax and transactions, EY teams ask better questions to find new answers for the complex issues facing our world today.

Experience Level Senior Level