Principal Data Scientist - AI

Opus 2
Charing Cross, United Kingdom
22 days ago

Role details

Contract type
Permanent contract
Employment type
Full-time (> 32 hours)
Working hours
Regular working hours
Languages
English
Experience level
Senior

Job location

Remote
Charing Cross, United Kingdom

Tech stack

Java
Artificial Intelligence
Python
Machine Learning
Software Engineering
TypeScript
Large Language Models
Question Answering
OPUS (Software)

Job description

We're looking for a Principal Data Scientist to lead the design of AI systems that can support complex, multi-step tasks, use tools, adapt to context, and make intelligent decisions. You'll work closely with product and engineering to architect LLM-powered features that are robust, useful, and production-ready not just impressive demos. This role is ideal for someone who not only understands data and AI deeply but also brings strong software engineering instincts. Someone who can design intelligent systems that operate reliably and scalably within a complex product environment., * You will explore and implement RAG or Graph RAG approaches to improve retrieval quality and reasoning in LLM workflows, including graph construction, entity linking, and hybrid scoring strategies.

  • Design and implement LLM-powered systems that support multi-step task automation, tool use, and context-aware reasoning within the product.
  • Contribute to prompt design and evaluate prompts results
  • Design and implement MLOps pipelines with best practises in mind
  • Prototype, evaluate, and ship AI features using platforms like Claude or Amazon Bedrock with a focus on production readiness, not just experimentation.
  • Develop evaluation frameworks for testing model output quality, reliability, and alignment with user goals (e.g., hallucination detection, prompt regression, safety scoring).
  • Work closely with engineers and designers to embed AI capabilities into real user workflows, ensuring that technical architecture supports meaningful product outcomes.
  • Own the full lifecycle of AI components from evaluation frameworks, planning and modeling to testing, deployment, and continuous improvement.
  • Contribute to our AI strategy and roadmap, helping shape how we scale LLM usage responsibly across the platform. You bridge product and engineering by embedding AI into user-facing features, not just prototypes.
  • Collaborate closely with Principal Engineer to align AI workflows, system prompts, and model interaction layers.

Requirements

Question Answering, Bedrock, Python, * Experience fine tuning models.

  • Ability to reason about multi-hop question answering, graph traversal, and integrating structured retrieval with LLM prompts.
  • Performance over time.
  • 5+ years experience in applied AI, machine learning systems, or data science roles with production responsibility.
  • Proficiency in Python, with experience building and maintaining AI systems, not just analyses.
  • Experience working in Java or TypeScript environments beneficial.
  • Experience with Claude, OpenAI, Bedrock is nice to have or experience with similar LLM platforms required.
  • Familiarity with RAG, Graph-based retrieval, prompt design, and multi-hop reasoning.
  • Experience deploying LLM-powered features into production environments.
  • Bonus: experience in vector stores, agent orchestration, or legaltech domain knowledge.

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