GenAI Data Scientist — LLM & GenAI Solutions (Hybrid)

EXL; Greater London; Hybrid; GBP 85,000 - 120,000; Full time

Benefits offered by this job

Generous bonus

Private healthcare

Critical illness cover (4x salary)

Income protection

Pension

Job summary

EXL is seeking a Data Scientist in London to lead GenAI initiatives, developing and deploying LLM-based applications, prompting, fine‑tuning, and retrieval‑augmented generation for enterprise use cases.

Ideal candidates will have hands‑on GenAI experience, strong Python skills, and a track record with OpenAI or similar models, plus experience deploying AI workflows via APIs or web apps.

Qualifications

• 5+ years of experience in Data Science / ML, with 1+ year hands-on in LLMs / GenAI projects.
• Strong Python programming skills, especially in libraries such as Transformers, LangChain, scikit-learn, PyTorch, or TensorFlow.
• Experience with OpenAI (GPT-4), Claude, Mistral, LLaMA, or similar models.
• Knowledge of vector search, embedding models (e.g., BERT, Sentence Transformers), and semantic search techniques.
• Ability to build scalable AI workflows and deploy them via APIs or web apps (e.g., FastAPI, Streamlit, Flask).
• Familiarity with cloud platforms (AWS/GCP/Azure) and MLOps best practices.
• Excellent communication skills with the ability to translate technical solutions into business impact.

Responsibilities

• Design and build Generative AI solutions using Large Language Models (LLMs) for business problems across domains like customer service, document automation, summarization, and knowledge retrieval.
• Fine‑tune or adapt foundation models using domain‑specific data.
• Collaborate with data engineers, MLOps, and product teams to build end‑to‑end AI applications and APIs.
• Develop custom prompts and prompt chains using tools like LangChain, LlamaIndex, PromptFlow, or custom frameworks.
• Evaluate model performance, mitigate bias, and optimize accuracy, latency, and cost.
• Stay up to date with the latest trends in LLMs, transformers, and GenAI architecture.

Skills

Python

Transformers

LangChain

OpenAI GPT-4

MLOps

Cloud

Communication

Tools

FastAPI

Streamlit

Flask

LlamaIndex

PromptFlow

Job description

EXL is seeking a Data Scientist in London to lead GenAI initiatives, developing and deploying LLM-based applications, prompting, fine‑tuning, and retrieval‑augmented generation for enterprise use cases.

Ideal candidates will have hands‑on GenAI experience, strong Python skills, and a track record with OpenAI or similar models, plus experience deploying AI workflows via APIs or web apps.