Principal Ontology Architect (Healthcare)

About Virtasant Virtasant is a global technology services company with a network of over 4,000 technology professionals across 130+ countries. We specialize in cloud architecture, infrastructure, migration, and optimization, helping enterprises scale efficiently while maintaining cost control. Our clients range from Fortune 500 companies to fast-growing startups, relying on us to build high-performance infrastructure, optimize cloud environments, and enable continuous delivery at scale. About the role We are building a senior team for a large enterprise program in healthcare operations. The program uses ontology and knowledge-graph design to help executives make operational decisions, act on them, and measure the results. We need a senior ontology lead who has done this before and can show it. You will work directly with senior client stakeholders, share real experience of ontologies you have designed and delivered, and then lead the ontology and semantic design. Engagement Immediate start, part-time for the first few weeks. Expected to move to full time on a multi-year engagement. Contractor. US-based with US work authorization. Occasional US travel What We’re Looking For Must-Have Experience You have designed and shipped production ontologies that drove real decisions , not just taxonomies or metadata catalogs. You can talk through two or three of them: the business problem, the model, what went wrong and what you would do differently. Business-first modeling . You start fr