Senior Ontology Engineer
Job in
Arlington, Arlington County, Virginia, 22201, USA
Listed on 2026-09-12
Listing for:
Socket.dev
Full Time
position Listed on 2026-09-12
Job specializations:
-
Software Development
AI Engineer (Applied/Software), Full Stack Developer, Python
Job Description & How to Apply Below
Pixel Rain 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,
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.
- 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.
Position Requirements
10+ Years
work experience
To View & Apply for jobs on this site that accept applications from your location or country, tap the button below to make a Search.
(If this job is in fact in your jurisdiction, then you may be using a Proxy or VPN to access this site, and to progress further, you should change your connectivity to another mobile device or PC).
(If this job is in fact in your jurisdiction, then you may be using a Proxy or VPN to access this site, and to progress further, you should change your connectivity to another mobile device or PC).
Search for further Jobs Here:
×