Sr. Data Scientist

LexisNexis; Chennai District; On-site; INR 2,600,000 - 4,800,000; Full time

Benefits offered by this job

Health insurance

Flexible working arrangement

Meals subsidies in Chennai

Medical screening

Long-service awards

New baby gift

Paid time off

Job summary

LexisNexis in Chennai, India, is seeking a Sr. Data Scientist to lead complex AI projects involving GenAI, RAG, and Agentic solutions for business delivery.

You will design, develop, and deploy ML and GenAI systems, optimize RAG pipelines, and fine-tune LLMs for production use. The role collaborates with Engineering, Product, and SMEs to deliver AI-driven features, while monitoring performance and implementing scalable pipelines.

Qualifications

• 6–8 years of experience in data science or AI engineering.
• Strong Python and ML skillset with production experience.
• Hands-on experience with GenAI, LLMs, RAG, and prompt engineering.

Responsibilities

• Design, develop, and deploy ML and GenAI solutions in production.
• Build and optimize Retrieval-Augmented Generation 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 features.
• Monitor model performance and drift in production.
• Conduct experimentation, A/B testing, and benchmarking.
• Contribute to architecture design for AI-powered systems.

Skills

Python

Machine Learning

NLP

GenAI

RAG

Prompt Engineering

LLMs

Distributed Systems

Tools

LangChain / LlamaIndex

Scikit-learn

XGBoost

LightGBM

PyTorch

TensorFlow

HuggingFace

OpenAI / 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

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 know your well-being and happiness are key to a long and successful career. We are delighted to offer country specific benefits. Click here to access benefits specific to your location.