Senior User Researcher - Agentic AI / Quantitative ResearchOutside IR35: 475 - 5255 month initial contract, likely to extendASAP StartOnce a week / once every 2 weeks to LondonWe are seeking an experienced Senior User Researcher to support a government department on a high-profile programme of work. The role will involve leading user research for the design and delivery of advanced AI/LLM-powered products and services, ensuring that accessibility, privacy, and safeguarding requirements are embedded into solutions at scale.You must either hold or be eligible for SC for this position.Key ResponsibilitiesLead the planning, design, and execution of user research activities for AI/LLM-powered services.Apply mixed-methods research (qualitative and quantitative) to capture user needs, behaviours, and expectations in complex, high-transaction environments.Evaluate and provide recommendations for training data collection, categorisation, and labelling from a user-centred perspective.Test and assess AI/LLM model outputs against user requirements, accessibility standards, and regulatory frameworks.Collaborate with AI engineers, designers, and product teams to translate research findings into actionable design and development decisions.Prototype and test new human-AI interaction patterns, ensuring transparency, oversight, and trust.Champion inclusive research practices, ensuring accessibility, safeguarding, and privacy are prioritised.Lead stakeholder workshops, service assessments, and