Vantor seeks an Ontology Subject Matter Expert to design and govern semantic data models powering modern web and data products. You will lead ontology design, knowledge graph structuring, and metadata standards to support search, analytics, and automation. Partner with engineers, data teams, and product owners to translate business domains into reusable models, ensure data quality and interoperability, and guide best practices. Contribute to client projects, documentation, and reviews in an agile, collaborative, low ego environment focused on craftsmanship and measurable outcomes.