We're hiring a contract Ontologist to design ontologies that help build out new AI domains within the business. This role focuses on developing semantic models and knowledge structures, helping shape how internal knowledge gets used by AI agents in product, data and global markets.

Responsibilities:

• Design ontologies from scratch that represent core business concepts and relationships across contexts, constraints and inference patterns, approaches to reasoning
• Structure knowledge for GraphRAG and Search from unstructured artifacts (documents, transcripts, reports, glossaries ) as well as for assembling agent context
• Work with engineers to determine how ontology gets queried, connected and reasoned over
• Produce design review artifacts and model documentation
• Validate, test against use cases, queries and workflows
• Establish maintenance process and build governance layer

Required Skills:

• Experience in ontology
• Experience with semantic standards (RDF, OWL, SHACL, SPARQL)
• Experience using ontology management platforms
• Experience with AI systems
• Experience with Large Language Models (LLMs)
• NLP knowledge
• Aware of how ontologies feed into AI systems and how agents retrieve and use structured context

*Remote role - no travel required*

Job Title: Data Ontologist

Location: London, UK

Job Type: Contract

Trading as TEKsystems. Allegis Group Limited, Bracknell, RG12 1RT, United Kingdom. No Allegis Group Limited operates as an Employment Business and Employment Agency as set out in the Conduct of Employment Agencies and Employment Businesses Regulations 2003. TEKsystems is a company within the Allegis Group network of companies (collectively referred to as "Allegis Group"). Aerotek, Aston Carter, EASi, Talentis Solutions, TEKsystems, Stamford Consultants and The Stamford Group are Allegis Group brands. If you apply, your personal data will be processed as described in the Allegis Group Online Privacy Notice available at our website.

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