AI Engineer - GraphRAG

Aubay UK is seeking an experienced AI Engineer with deep expertise in GraphRAG, knowledge graphs and modern AI engineering to join a high-profile Trading & Supply Emerging Technology initiative. This is a 6‑month contract inside IR35 focused on researching, prototyping and scaling advanced AI capabilities that combine LLMs, graph-based retrieval, semantic technologies and agentic AI. The role will work closely with front-office users to identify high-value opportunities, validate hypotheses and build solutions with a credible path to production.

Location

Waterloo, London. Hybrid working model with 2–3 days per week onsite.

Required Skills and Experience

• Strong hands-on experience designing and delivering GraphRAG solutions in enterprise
• Experience with Azure AI Foundry (or equivalent AI platforms), LangChain and/or LangGraph.
• Practical expertise in knowledge graph design, graph schemas, ontologies, entities, relationships and traversal patterns.
• Experience combining knowledge graphs with LLMs, RAG architectures and semantic/vector retrieval.
• Experience with graph databases such as Neo4j or equivalent technologies.
• Strong AI engineering and software development experience using modern programming frameworks and cloud-native architectures.
• Experience building scalable solutions using LLMs, AI agents and advanced AI frameworks.
• Strong understanding of semantic modelling, GraphQL and graph-based architectures.
• Experience supporting or building technology for front-office trading teams.
• Practical understanding of how trading decisions are informed by market data, analytics, positions, forecasts and qualitative information.
• Experience evolving experimental concepts into scalable production-ready solutions.
• Strong understanding of APIs, cloud platforms, enterprise integration, data engineering and

Desired Skills and Experience

• Experience within commodities, energy or trading markets.
• Knowledge of agentic AI, semantic layers and advanced retrieval technique
• Experience working with traders, quantitative analysts, market analysts or trading technology teams.
• Understanding of market fundamentals, pricing, exposures, forecasts and physical trading flows.
• Awareness of how qualitative information such as news, regulation and geopolitical events
• Knowledge of Trading & Supply business processes across front, middle and back office functions.

Role Responsibilities

• Design and build GraphRAG and knowledge graph-based AI solutions.
• Create graph data models, ontologies and semantic representations for complex business domains.
• Develop retrieval and reasoning approaches combining graph traversal, vector search and LLM capabilities.
• Partner directly with front-office users to understand workflows, challenges and decisionmaking processes.
• Research and evaluate emerging AI technologies and techniques.
• Rapidly prototype innovative solutions and assess commercial value.
• Build solutions with scalability, maintainability and production adoption in mind.
• Translate complex business and trading concepts into AI-ready technical models.
• Integrate AI solutions using APIs, GraphQL and enterprise platforms.
• Contribute to AI architecture, strategy, governance and responsible deployment practices.
• Support evaluation, monitoring and guardrails for AI-enabled capabilities.
• Focus on a small number of strategic priorities to maximise business impact.

About Aubay UK

Aubay UK is a trusted IT insourcing and business scaling partner, helping organisations deliver transformation through high-performing teams, offering roles across London, the West Midlands and Belfast. Based in Canary Wharf, we take on a people-first approach, enabling IT consultants to work on meaningful projects across the Energy, FinTech, and financial services sectors, while building stable careers, gaining valuable project exposure and benefiting from long-term development in a supportive working environment. Built on reliability and partnership, and backed by a wider global Aubay Group network of more than 9,000 experts, we offer a low-risk, high-value delivery model.

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