Data Ontologist

TEKsystems

Full-time London, England Mathematical Science Occupations

Posted:

June 09, 2026

Location:

London, England, United Kingdom

Job Description

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 o...
                

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Job Overview

Job Type: Full-time

Location: London, United Kingdom

Posted: June 09, 2026

Deadline: July 19, 2026