Ontologist

The world’s most popular audio streaming subscription service is looking for a Ontologist to join the band in a consultant assignment. The client has transformed music listening forever when launched in 2008.

Period: ASAP to 2026-11-17 (full-time), with a possibility of extension.

About the role

We’re hiring a contract Ontologist to design ontologies that help build out new AI domains within our client. This role focuses on developing semantic models and knowledge structures, helping to make our client's internal knowledge usable by AI systems.

Operating within a small central team, you’ll work with many partners in engineering, product, and data science across organizational boundaries.

What you'll do

• Design ontologies from scratch that represent core business concepts and relationships across contexts, constraints, and inference patterns, as well as approaches to reasoning

• Structure knowledge for GraphRAG and search from unstructured artifacts (documents, transcripts, reports, glossaries, etc.), as well as for assembling agent context

• Work with engineers to determine how the ontology will be queried, connected, and reasoned over

• Produce design review artifacts and model documentation

• Validate and test against use cases, queries, and workflows

• Establish maintenance processes and build a governance layer
  
  Who you are

  • Background in ontology / knowledge representation

  • Experience modeling with semantic standards (RDF, OWL, SHACL, SPARQL) and calibrating expressivity

  • Experience using ontology management platforms

  • Understanding of how ontologies feed into AI systems and how agents retrieve and use structured context

  • Ability to use AI to scale your own output and efficiency

  • Multilingual experience is a plus

  • Degree in information science or a related field

We are Market Partner

Market Partner is proud to be an equal opportunity employer. You are welcome to our community regardless of who you are, no matter where you come from, or what you look like. We apply ongoing selection and may fill the position as soon as we find the right candidate.