Sr. Data Scientist

LexisNexis · Chennai

  • Experience6–8 yrs
  • SalaryNot disclosed
  • Work modeonsite
  • Levelsenior
  • Posted18 Sept 2026
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About LexisNexis

LexisNexis is hiring in Chennai in professional services. This role looks for around 6+ years of experience.

Skills

  • Python
  • Machine Learning
  • Natural Language Processing
  • Generative AI
  • Large Language Models
  • Prompt Engineering
  • Retrieval-Augmented Generation
  • Vector Search
  • Model Evaluation
  • SQL
  • LangChain
  • LlamaIndex
  • scikit-learn
  • XGBoost
  • LightGBM
  • PyTorch
  • TensorFlow
  • Hugging Face
  • OpenAI API
  • Pinecone
  • FAISS
  • Weaviate
  • OpenSearch
  • AWS
  • Azure
  • Google Cloud Platform
  • Continuous Integration and Continuous Deployment

The role

A data scientist at a professional information company builds machine learning and Generative AI solutions using Python, Retrieval-Augmented Generation, and Large Language Models. The role develops vector search, prompt engineering, and model evaluation capabilities for AI-powered business delivery.

Full 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 environmentsBuild and optimize Retrieval-Augmented Generation (RAG) pipelinesFine-tune and evaluate Large Language Models (LLMs)Develop prompt engineering strategies and evaluation frameworksImplement scalable ML pipelines using PythonWork with structured and unstructured data sourcesCollaborate with Engineering, Product, and SMEs to deliver AI-driven featuresMonitor model performance, drift, and reliability in productionConduct experimentation, A/B testing, and performance benchmarkingContribute 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 searchModel evaluation and validation frameworks

ML & AI Tools

LangChain / LlamaIndex (or similar frameworks)Scikit-learn / XGBoost / LightGBMPyTorch / TensorFlowHuggingFace / OpenAI / LLM APIsVector databases (Pinecone, FAISS, Weaviate, OpenSearch, etc.)

Data & Infrastructure

SQL and data queryingExperience with AWS / Azure / GCPCI/CD for ML deploymentsModel tracking tools (MLflow preferred)

Good to Have

Experience in legal, regulatory, or publishing domainsExperience with model monitoring and MLOpsKnowledge 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.