Senior Ontology Engineer
About The Position
PixelRain AI is a small, fast-moving AI company delivering an AI-powered product-lifecycle knowledge platform for a U.S. Department of War (DoW) customer. This platform includes governed ingestion of technical documents, an enterprise ontology and knowledge graph, and generative-AI applications that draft maintenance-planning products and answer engineering questions with citations. The system runs in the customer's cloud environment with an offline variant for disconnected use. This role involves working in a small team, with real users, and demonstrating working software every sprint.
Requirements
- Active US Security Clearance Required
- 5+ years of hands-on semantic-technology work: OWL, RDF/Turtle, SHACL, and SPARQL.
- Experience building ontologies aligned to an upper ontology — BFO and CCO strongly preferred.
- Production experience with a triple store (Apache Jena/Fuseki, RDF4J, or similar).
- Solid general software engineering: Python, APIs, Git — able to handle full-stack tasks (web + AWS), not ontology-only.
- Working familiarity with LLMs and RAG — you’ve connected structured knowledge to generative applications.
Responsibilities
- Design, build, and maintain the enterprise ontology (BFO/CCO-aligned) and controlled vocabularies, and map source-system data into them.
- Build and manage the knowledge graph: RDF triple store (Apache Jena/Fuseki or similar), SHACL validation, SPARQL queries.
- Build the governed ingestion path so extracted content lands in the graph with provenance and confidence, and connect the graph to retrieval and GenAI applications.
- Carry normal full-stack development work alongside the ontology work — Python services, web UI, AWS.
- Work in a small Scrum team; demo working software every sprint.
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What This Job Offers
Job Type
Full-time
Career Level
Senior
Education Level
No Education Listed
