GenAI Engineer - London - £140k + bonus
RJC Group are currently partnered with a Major Financial Services company based in London, looking for a GenAI Engineer to join their growing AI team.
This is an exciting opportunity to work with cutting-edge technology, define AI standards and directly interact with the business.
What you'll do:
- Build RAG services: document ingestion, parsing, chunking, indexing, retrieval, reranking, context assembly
- Develop shared platform capabilities for LLM applications, agentic systems and enterprise knowledge solutions
- Define reference architectures, engineering standards and implementation patterns for GenAI applications
- Design agentic workflows that safely interact with internal APIs, databases, search systems and third-party services
- Set standards for tool contracts, structured outputs, context management, prompting, model selection and routing
- Build reusable components, APIs and libraries for other engineering teams
- Evaluate LLM, retrieval and agent performance via automated metrics, test datasets and regression testing
- Guide decisions on model quality, latency, cost, observability and operational resilience
What we're looking for:
- Track record delivering LLM-based applications or AI platforms in production
- Foundation-model APIs/platforms — OpenAI, Anthropic, Google Vertex AI, AWS Bedrock
- Python-based API/service development, ideally with async frameworks
- Agent frameworks and orchestration tools — LangGraph, LangChain, LlamaIndex, CrewAI, or similar
- LLM evaluation, observability, tracing and regression testing
- Prompt management, model routing, structured-output generation
- Cloud deployment and containerised production AI service
- Strong software engineering fundamentals across the full production lifecycle
- Degree in computer science, ML, AI, data science, math, stats or related field — or equivalent experience
Apply below with an up-to-date CV to set up an initial confidential discussion