Senior Ontology Engineer — Secret Clearance, GenAI-Ready

InterImage, Inc.; Arlington (VA); Hybrid; USD 175,000 - 228,000; Full time

Job summary

PixelRain AI is a small, fast-moving AI company delivering an AI-powered product-lifecycle knowledge platform for a U.S. Department of War customer: governed ingestion of technical documents, an enterprise ontology and knowledge graph, and generative AI apps that draft maintenance plans 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.

Qualifications

• 5+ years of hands-on semantic-technology work: OWL, RDF/Turtle, SHACL, 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.
• Working familiarity with LLMs and RAG — connected structured knowledge to generative apps.

Responsibilities

• Design, build, and maintain the enterprise ontology and vocabularies and map source data into them.
• Build and manage the knowledge graph: RDF store, SHACL validation, SPARQL queries.
• Ingest content with provenance and connect the graph to retrieval and GenAI apps.
• Carry full-stack development work alongside ontology work — Python services, web UI, AWS.
• Work in a small Scrum team; demo working software every sprint.

Skills

Ontology design

Semantic technologies

Python

Full-stack development

AWS

LLMs / RAG

SPARQL

Git

Tools

Apache Jena/Fuseki

RDF4J

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 customer: governed ingestion of technical documents, an enterprise ontology and knowledge graph, and generative AI apps that draft maintenance plans 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.