Create Alert

Ontology Expert - Remote

Apply now »

Date: Apr 23, 2026

Location: Toronto, ON, CA

Company: NTT DATA Services

Req ID: 369018 

NTT DATA strives to hire exceptional, innovative and passionate individuals who want to grow with us. If you want to be part of an inclusive, adaptable, and forward-thinking organization, apply now.

We are currently seeking a Ontology Expert - Remote to join our team in Toronto, Ontario (CA-ON), Canada (CA).

 

Role Summary 

We are seeking an experienced Ontology Expert to design, develop, and govern healthcare ontologies and semantic models that power AI‑driven and agentic healthcare solutions. This role focuses on enabling interoperability, reasoning, knowledge representation, and explainable AI across clinical and healthcare enterprise systems. 

 

Day to Day job Duties:  

  • Design, build, and maintain healthcare ontologies, taxonomies, and semantic models. 

  • Define domain vocabularies, concepts, and relationships for AI‑driven and agentic solutions. 

  • Support knowledge representation for AI agents, clinical decision‑support, and intelligence systems. 

  • Collaborate with clinicians, data scientists, and AI engineers to translate domain knowledge into formal semantic models. 

  • Govern ontology lifecycle, versioning, documentation, and semantic consistency. 

Healthcare Ontology & Semantic Modeling 

  • Develop ontologies using OWL, RDF, and SKOS standards. 

  • Apply healthcare terminologies including SNOMED CT, ICD‑10, LOINC, and RxNorm. 

  • Enable semantic interoperability across EHRs and healthcare data sources. 

  • Support reasoning, inference, and rule‑based logic for AI systems. 

AI & Agentic Solution Support 

  • Enable AI and GenAI systems with structured healthcare knowledge. 

  • Support agentic workflows, decision models, and explainable AI (XAI) outputs. 

  • Collaborate on RAG pipelines and knowledge graph integration for LLM‑based systems. 

  • Ensure semantic accuracy, safety, and clinical relevance of AI outputs. 

 

Basic Qualifications 

  • Bachelor’s or Master’s degree in Computer Science, Health Informatics, Data Science, Semantic Web, or related field. 

  • 4–8+ years of experience in ontology development or semantic modeling, preferably in healthcare. 

  • Strong understanding of US healthcare data and terminology. 

  • Hands‑on experience with ontology languages, standards, and modeling techniques. 

  • Proficiency in Python for ontology processing, validation, or AI integration. 

  • Experience working with cross‑functional AI and clinical teams. 

 

Nice to Have 

  • Experience with knowledge graphs and graph databases. 

  • Exposure to LLMs, GenAI, and agentic AI architectures. 

  • Familiarity with FHIR‑aligned semantic models. 

  • Experience in payer / managed care environments (Medicaid, Medicare). 

  • Cloud platform experience (AWS, Azure, or GCP). 

 

 

About NTT DATA

NTT DATA is a $30+ billion business and technology services leader, serving 75% of the Fortune Global 100. We are committed to accelerating client success and positively impacting society through responsible innovation. We are one of the world’s leading AI and digital infrastructure providers, with unmatched capabilities in enterprise-scale AI, cloud, security, connectivity, data centers and application services.  Our consulting and industry solutions help organizations and society move confidently and sustainably into the digital future. As a Global Top Employer, we have experts in more than 50 countries. We also offer clients access to a robust ecosystem of innovation centers as well as established and start-up partners. NTT DATA is part of NTT Group, which invests over $3 billion each year in R&D.

 

Whenever possible, we hire locally to NTT DATA offices or client sites. This ensures we can provide timely and effective support tailored to each client’s needs. While many positions offer remote or hybrid work options, these arrangements are subject to change based on client requirements. For employees near an NTT DATA office or client site, in-office attendance may be required for meetings or events, depending on business needs. At NTT DATA, we are committed to staying flexible and meeting the evolving needs of both our clients and employees. NTT DATA recruiters will never ask for payment or banking information and will only use @nttdata.com and @talent.nttdataservices.com email addresses. If you are requested to provide payment or disclose banking information, please submit a contact us form, https://us.nttdata.com/en/contact-us.

 

NTT DATA endeavors to make https://us.nttdata.com accessible to any and all users. If you would like to contact us regarding the accessibility of our website or need assistance completing the application process, please contact us at https://us.nttdata.com/en/contact-us. This contact information is for accommodation requests only and cannot be used to inquire about the status of applications. NTT DATA is an equal opportunity employer. Qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, disability or protected veteran status. For our EEO Policy Statement, please click here. If you'd like more information on your EEO rights under the law, please click here. For Pay Transparency information, please click here.

 

#LI-NorthAmerica

 


Job Segment: Computer Science, Informatics, Consulting, Technology

Apply now »