Senior Ontology Engineer

InterImage · Arlington, VA · Remote

Posted 9/8/2026 · last confirmed live 10/17/2026

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: 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 — running in the customer's cloud environment, with an offline variant for disconnected use. Small team, real users, working software demonstrated every sprint. Salary: 175,000 - 228,000 Active US Security Clearance Required What you'll do • 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. Requirements Active Secret OR Top Secret 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.

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This role is published by InterImage on workable. SwiftFit is not the employer and does not accept applications.