About this opportunity
InterImage lists this Senior Ontology Engineer opportunity in arlington, Virginia. Review the employer’s description below for duties, qualifications and application requirements.
Job description
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
What You'll Do
Active US Security Clearance Required
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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Worksite address
arlington, VA, 22201, US
Who can apply
Review the original listing for work authorization, qualifications and employer requirements.