# Senior Ontology Engineer

> InterImage · Arlington, United States (Remote) · Full-time · Posted 2026-09-08

**Salary:** USD 175,000–228,000

**Workplace:** remote

## 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**

**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.

## Apply

[Apply at InterImage](https://apply.workable.com/interimage/j/C825A751D2/apply)

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