LLM Data Scientist

If you're someone who loves the intersection of LLM systems, experimentation, and realworld product impact, this is the kind of role where your work won't stay hidden. You'll see it live, in customerfacing journeys, SEO performance, personalisation, and in the quality of the content we publish.

And to be clear: this is not a role for someone who has only ever engineered prompts in isolation. You'll definitely write prompts - but the value here comes from understanding how LLMs behave in real systems, with real data, and knowing how to evaluate, measure, optimise and deploy them at scale. If you have the data science mindset and the LLM engineering skillset, this is where you can genuinely shape things.

What you'll actually be doing?

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• Designing, testing, and optimising prompts and promptchains for production LLM applications
  
• Building evaluation frameworks to measure quality, safety, relevance, latency and cost
  
• Working with RAG architectures, embeddings and vector databases to improve retrieval and contextual accuracy
  
• Owning and developing our SEO contentoptimisation tool - improving product page copy for both relevance and discoverability
  
• Helping power personalised recommendations and messaging in our Personalisation squad
  
• Enhancing our Wellness Hub (our library of health articles and expert content) by generating, rewriting and improving pieces in safe, evidencebased ways
  
• Partnering with Data Engineering on context management, memory strategies, tool/functioncalling, observability and logging
  
• Monitoring and mitigating model drift, prompt degradation and system regressions
  
• Acting as a goto LLM expert across the business, helping teams understand what's possible and what's not
  
• Staying close to the evolving LLM landscape and translating new ideas into useful, practical improvements
  

How we'll see your impact

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• Customers engage more with product pages because the content is more helpful and tailored
  
• SEO performance improves thanks to your optimisation tools
  
• We publish higherquality health content that's accurate, engaging and aligned with our brand
  
• Customers receive more relevant recommendations at the right moment
  
• Internal teams work faster thanks to stronger, more reliable LLMpowered tools
  
• Clear evaluation metrics guide smarter, datadriven AI adoption
  
• LLM capability across H&B grows because you've helped demystify the technology