Senior AI Engineer

dunnhumby is the global leader in Customer Data Science, empowering businesses everywhere to compete and thrive in the modern data-driven economy. We always put the Customer First.

Our mission: to enable businesses to grow and reimagine themselves by becoming advocates and champions for their Customers. With deep heritage and expertise in retail – one of the world's most competitive markets, with a deluge of multi-dimensional data – dunnhumby today enables businesses all over the world, across industries, to be Customer First.

dunnhumby employs nearly 2,500 experts in offices throughout Europe, Asia, Africa, and the Americas working for transformative, iconic brands such as Tesco, Coca-Cola, Meijer, Procter & Gamble and Metro.

Most companies try to meet expectations, dunnhumby exists to defy them. Using big data, deep expertise and AI-driven platforms to decode the 21st century human experience – then redefine it in meaningful and surprising ways that put customers first. Across digital, mobile and retail. For brands like Tesco, Coca-Cola, Procter & Gamble and PepsiCo.

We are looking for an experienced GenAI Engineer with deep expertise in prompt engineering, retrieval-augmented generation (RAG), and vector-based search systems to help integrate GenAI into our engineering and DevOps ecosystem. As a senior engineer, you will build intelligent, context-aware assistants and agents that augment CI/CD workflows, knowledge retrieval, incident handling, and developer productivity using LLMs, Python, and NLP pipelines. You will lead the charge in making our platform smarter and more autonomous by embedding GenAI natively into infrastructure and developer experience workflows

Key Responsibilities

• Design, iterate, and optimize prompts for task-specific LLM workflows with high accuracy, relevance, and controllability

• Build RAG pipelines using vector databases like FAISS, Weaviate, Pinecone, or similar to support knowledge retrieval and contextual AI agents

• Integrate LLMs into internal engineering tools, CI/CD workflows, and observability systems for real-time summarization, automation, and productivity enhancement

• Leverage Python-based frameworks like LangChain, LlamaIndex, Haystack, and others to implement end-to-end GenAI solutions

• Fine-tune open-source or commercial models (OpenAI, Claude, Cohere, Mistral, etc.) as needed for domain-specific use cases

• Collaborate with DevOps and platform teams to identify automation and GenAI augmentation opportunities

• Ensure data privacy, governance, and ethical standards are met when using internal datasets or embedding knowledge

• Optimize response quality through prompt chaining, feedback loops, and context compression techniques

• Experience integrating GenAI into CI/CD tools, obserrvability dashboards, or chat-based interfaces.

Required Skills & Experience

• 6+ years in engineering roles with 2+ years hands-on in GenAI, NLP, or LLMbased systems

• Proven experience in prompt engineering and LLM integration for backend or infrastructure automation

• Strong Python development skills and working knowledge of LangChain, LlamaIndex, Hugging Face Transformers, or similar GenAI libraries

• Deep understanding of vector databases (e.g., FAISS, Pinecone, Weaviate, Qdrant) and embedding techniques

• Experience designing and deploying RAG architectures for internal knowledge access and contextually intelligent systems

• Familiarity with NLP concepts like tokenization, summarization, intent extraction, semantic similarity, etc.

• Experience with LLM APIs (OpenAI, Azure OpenAI, Claude, etc.) and streaming response generation
• Ability to work in fast-paced, iterative development cycles in a collaborative DevOps/platform engineering environment

Nice to Have

• Understanding of multi-modal models or fine-tuning open LLMs for specialized use

• Familiarity with developer-facing GenAI use cases: changelog generation, log triage, infra as code review, chatbot copilots

• Experience working with Kubernetes, GitOps, or DevSecOps platforms a plus

What you can expect from us

 We won't just meet your expectations. We'll defy them. So you'll enjoy the comprehensive rewards package you'd expect from a leading technology company. But also, a degree of personal flexibility you might not expect.  Plus, thoughtful perks, like flexible working hours and your birthday off.

You'll also benefit from an investment in cutting-edge technology that reflects our global ambition. But with a nimble, small-business feel that gives you the freedom to play, experiment and learn.

And we don't just talk about diversity and inclusion. We live it every day – with thriving networks including dh Gender Equality Network, dh Proud, dh Family, dh One and dh Thrive as the living proof. Everyone's invited.

Our approach to Flexible Working

At dunnhumby, we value and respect difference and are committed to building an inclusive culture by creating an environment where you can balance a successful career with your commitments and interests outside of work.

We believe that you will do your best at work if you have a work / life balance. Some roles lend themselves to flexible options more than others, so if this is important to you please raise this with your recruiter, as we are open to discussing agile working opportunities during the hiring process.

For further information about how we collect and use your personal information please see our Privacy Notice which can be found (here)

What you can expect from us

We won't just meet your expectations. We'll defy them. So you'll enjoy the comprehensive rewards package you'd expect from a leading technology company. But also, a degree of personal flexibility you might not expect.  Plus, thoughtful perks, like flexible working hours and your birthday off.

You'll also benefit from an investment in cutting-edge technology that reflects our global ambition. But with a nimble, small-business feel that gives you the freedom to play, experiment and learn.

And we don't just talk about diversity and inclusion. We live it every day – with thriving networks including dh Gender Equality Network, dh Proud, dh Family, dh One, dh Enabled and dh Thrive as the living proof.  We want everyone to have the opportunity to shine and perform at your best throughout our recruitment process. Please let us know how we can make this process work best for you. 

Our approach to Flexible Working

At dunnhumby, we value and respect difference and are committed to building an inclusive culture by creating an environment where you can balance a successful career with your commitments and interests outside of work.

We believe that you will do your best at work if you have a work / life balance. Some roles lend themselves to flexible options more than others, so if this is important to you please raise this with your recruiter, as we are open to discussing agile working opportunities during the hiring process.

For further information about how we collect and use your personal information please see our Privacy Notice which can be found (here)