Senior AI Engineer (GenAI)

TL;DR

Senior AI Engineer (GenAI): Building and scaling systems for Generative AI models, including LLMs, RAG, and agents, with an accent on knowledge retrieval pipelines and AI platform services. Focus on developing production-grade asynchronous Python services and implementing frameworks for AI observability and output quality evaluation.

Location: Hybrid in London, UK

Company

A technology-driven energy supplier accelerating the transition to a low-carbon future via its proprietary Kraken platform.

What you will do

• Design and develop scalable AI platform services to expose GenAI models, retrieval pipelines, and agent workflows.
• Build and maintain knowledge retrieval systems, processing heterogeneous documents into embedding pipelines.
• Optimize unstructured content to be AI-ready by enhancing structure and adding machine-readable metadata.
• Establish frameworks for AI Ops, observability, and monitoring of output quality, safety, and cost.
• Act as a technical centre of excellence for LLM usage and best practices across the organization.
• Implement governance layers for PII redaction and prompt filtering.

Requirements

• 2+ years of hands-on experience productionizing LLM applications.
• Deep technical knowledge of vector databases (e.g., Qdrant, Weavite, Pinecone, pgvector) and orchestration layers (LangGraph, LlamaIndex).
• Strong software engineering fundamentals with deep experience in asynchronous Python (asyncio, FastAPI).
• Proven experience solving production RAG challenges such as context window management and semantic routing.
• Mastery of Git, automated testing, CI/CD pipelines, and cloud platforms like AWS.
• Must be based in or able to work hybrid in London, UK.

Nice to have

• Experience with GraphRAG and Knowledge Graphs (e.g., Neo4j).
• Experience deploying and fine-tuning open-weight models via frameworks like vLLM or Ollama.
• Practical experience implementing semantic caching layers to reduce API costs and latency.

Culture & Benefits

• High-autonomy environment where employees are encouraged to learn, decide, and build quickly.
• Co-ownership model where hard work is rewarded with genuine ownership.
• Ranked as one of the top companies to work for in the UK.
• Comprehensive employee benefits package focused on flexibility and growth.