Sr. Data Scientist

LexisNexis Legal & Professional group; Gurugram District; On-site; INR 2,500,000 - 4,000,000; Full time

Benefits offered by this job

Health Insurance

Life Insurance

Flexible Working Arrangement

Medical Screening

Paid Time Off

Employee Assistance Program

New Baby Gift

Transport/Commuting Support

Job summary

LexisNexis Legal & Professional group seeks a Senior Data Scientist to design, develop, and deploy advanced ML and GenAI solutions in production. You will build RAG pipelines, fine-tune LLMs, and craft prompt engineering strategies while collaborating with engineering, product, and SMEs to deliver AI-driven features.

You will monitor model performance, conduct experiments and A/B tests, and contribute to scalable AI architecture across structured and unstructured data sources.

Qualifications

• Proficient in Python and ML/NLP
• Experience with Generative AI and LLMs
• Experience with RAG pipelines and embeddings
• Familiar with model evaluation frameworks
• Experience with ML deployment and CI/CD for ML

Responsibilities

• Design, develop, and deploy ML and GenAI solutions in production environments
• Build and optimize Retrieval-Augmented Generation (RAG) pipelines
• Fine-tune and evaluate Large Language Models (LLMs)
• Develop prompt engineering strategies and evaluation frameworks
• Implement scalable ML pipelines using Python
• Work with structured and unstructured data sources
• Collaborate with Engineering, Product, and SMEs to deliver AI-driven features
• Monitor model performance, drift, and reliability in production
• Conduct experimentation, A/B testing, and performance benchmarking
• Contribute to architecture design for AI-powered systems

Skills

Python (advanced proficiency)

ML & NLP

GenAI

RAG architecture

Model evaluation

Tools

LangChain

LlamaIndex

Scikit-learn

XGBoost

LightGBM

PyTorch

TensorFlow

HuggingFace

LLM APIs

Vector databases

Job description

About The Role:

The Sr. Data Scientist to work on complex project involving AI, GenAI, RAG and Agentic Solution for the business delivery projects

Responsibilities

• Design, develop, and deploy machine learning and GenAI solutions in production environments
• Build and optimize Retrieval-Augmented Generation (RAG) pipelines
• Fine-tune and evaluate Large Language Models (LLMs)
• Develop prompt engineering strategies and evaluation frameworks
• Implement scalable ML pipelines using Python
• Work with structured and unstructured data sources
• Collaborate with Engineering, Product, and SMEs to deliver AI-driven features
• Monitor model performance, drift, and reliability in production
• Conduct experimentation, A/B testing, and performance benchmarking
• Contribute to architecture design for AI-powered systems

Requirements

Experience: 6-8 Years

Core Stack

• Python (advanced proficiency)
• Machine Learning (supervised/unsupervised learning, NLP)
• Generative AI (LLMs, prompt engineering, embeddings)
• RAG architecture and vector search
• Model evaluation and validation frameworks

ML & AI Tools

• LangChain / LlamaIndex (or similar frameworks)
• Scikit-learn / XGBoost / LightGBM
• PyTorch / TensorFlow
• HuggingFace / OpenAI / LLM APIs
• Vector databases (Pinecone, FAISS, Weaviate, OpenSearch, etc.)

Data & Infrastructure

• SQL and data querying
• Experience with AWS / Azure / GCP
• CI/CD for ML deployments
• Model tracking tools (MLflow preferred)

Good to Have

• Experience in legal, regulatory, or publishing domains
• Experience with model monitoring and MLOps
• Knowledge of fine-tuning techniques (LoRA, PEFT, QLoRA)
• Experience with multi-agent frameworks (AutoGen, LangGraph, etc.){Empty}

Working for you:

We know that your wellbeing and happiness are key to a long and successful career. These are some of the benefits we are delighted to offer:

• Comprehensive Health Insurance: Covers you, your immediate family, and parents.
• Enhanced Health Insurance Options: Competitive rates negotiated by the company.
• Group Life Insurance: Ensuring financial security for your loved ones.
• Group Accident Insurance: Extra protection for accidental death and permanent disablement.
• Flexible Working Arrangement: Achieve a harmonious work-life balance.
• Employee Assistance Program: Access support for personal and work-related challenges.
• Medical Screening: Your well-being is a top priority.
• Modern Family Benefits: Maternity, paternity, and adoption support.
• Long-Service Awards: Recognizing dedication and commitment.
• New Baby Gift: Celebrating the joy of parenthood.
• Subsidized Meals in Chennai: Enjoy delicious meals at discounted rates.
• Various Paid Time Off: Take time off with Casual Leave, Sick Leave, Privilege Leave, Compassionate Leave, Special Sick Leave, and Gazetted Public Holidays.
• Free Transport pick up and drop from the home -office - home (applies in Chennai)

We are an equal opportunity employer: qualified applicants are considered for and treated during employment without regard to race, color, creed, religion, sex, national origin, citizenship status, disability status, protected veteran status, age, marital status, sexual orientation, gender identity, genetic information, or any other characteristic protected by law.

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