Senior Data Scientist

🚨 Senior Applied AI Scientist | Contract I'm currently working on an exciting contract opportunity for a Senior Applied AI Scientist to join a growing AI business, working on taking AI applications from proof of concept through to production. 💰 Up to £700 a day- Ideally around the £600-£650 mark though! 📄 Outside IR35 📅 6-month contract 🌍 Fully remote ⚡ ASAP start 🎯 2-stage interview process The key requirement for this role is strong experience in AI evaluations and setting up evaluation frameworks. You'll be responsible for establishing how AI systems are measured, tested and improved, ensuring there is clear evidence behind the quality and reliability of the applications being built. What you'll be doing: 🔹 Designing and building evaluation frameworks for LLM and RAG-based applications 🔹 Defining metrics, benchmarks and acceptance criteria to determine whether an AI application is ready for production 🔹 Building golden datasets and ground-truth benchmarks, working with subject matter experts to establish what good looks like 🔹 Evaluating areas including retrieval precision, recall, groundedness, faithfulness and end-to-end answer quality 🔹 Developing regression testing to ensure quality remains consistent as models, prompts and data evolve 🔹 Working with LLM-as-a-judge methodologies, calibrated against human judgement 🔹 Using evaluation results and production feedback to identify failure modes and continuously improve AI systems 🔹 Taking AI applications from PoC through to production, establishing the evaluation gates and evidence required for release 🔹 Working closely with engineers and AI specialists across LLMs, RAG, retrieval and knowledge graphs What we're looking for: Someone with a strong hands-on background in Applied AI / ML, particularly around evaluating and improving LLM-based systems. You should have experience with: 🔹 LLMs and RAG 🔹 AI/LLM evaluation methodologies 🔹 Building evaluation frameworks from scratch 🔹 Golden datasets and benchmark creation 🔹 LLM-as-a-judge / human evaluation 🔹 Retrieval evaluation and optimisation 🔹 Productionising LLM applications 🔹 Python and modern AI engineering practices Experience with tools such as Ragas, DeepEval, LangSmith or promptfoo would be highly beneficial. This is a great opportunity for someone who enjoys being responsible for proving whether AI actually works, rather than simply building the models themselves. If you have strong experience across LLM evaluations, RAG and evaluation frameworks and are available for an ASAP start, please apply below!