Ontology Engineer

Role: Ontology Engineer Location: UK Type: Contract Essential Skills: Proven experience in ontology engineering with hands-on OWL, RDF and SKOS delivery in a production or client-facing environment specific semantic ontology and taxonomy experience particularly using tools (Protege and Graphview) Ability to extend and refine existing ontologies, not just build from scratch Strong SPARQL capability including validation and reasoning queries Experience owning and governing taxonomies as versioned, change-controlled assets Understanding of how ontologies and taxonomies feed into AI and RAG systems Strong documentation discipline and ability to record modelling rationale clearly Experience collaborating with technical teams including data engineers and AI developers Highly Desirable: Experience with Protege, TopBraid or equivalent ontology tooling Familiarity with SHACL for constraint validation Background in financial services, private equity or similarly structured enterprise environments Understanding of knowledge grounding principles for large language models Experience with linked data architectures and triple store platforms The Context: Thebes Group is an optimisation company specialising in AI-enabled transformation. We help organisations improve workflow, reporting, information management, and operational decision-making by combining process optimisation, knowledge architecture, semantic technologies, automation, and artificial intelligence. We are currently ..... full job details .....