Senior Ontology and Knowledge Engineer

Vizient, Inc; Irving (TX); On-site; USD 102,000 - 179,000; Full time

Benefits offered by this job

Comprehensive benefits

Incentive eligibility

Job summary

Vizient, Inc. in Irving, TX is seeking a senior Ontology Engineer to develop and maintain semantic ontologies and models that enable high-quality, interoperable data across the organization.

You will translate business concepts into scalable semantic representations and contribute to knowledge graph development and AI-enabled solutions. Collaborate with product, data, and analytics teams to document, govern, and production‑ize semantic assets, applying standards such as RDF/OWL and tools like

Qualifications

• Experience with Semantic Web standards and technologies (RDF/OWL/SKOS/SHACL).
• Hands-on with graph databases and triplestores; semantic modeling and query performance.
• Experience integrating disparate datasets via semantic mappings and validation.
• Proficiency with ontology tools and workflows (Protégé, TopBraid, PoolParty, Stardog).
• Familiarity with foundational/top-level ontologies (BFO, DOLCE, OBO Foundry).
• Programming knowledge (Python/Java) to support automation and semantic pipelines.
• Experience with Git-based version control, CI/CD, testing and validation.

Responsibilities

• Design, develop, and maintain ontologies, vocabularies, and semantic models aligned with analytics needs.
• Translate client use cases into semantic requirements and implementable models.
• Collaborate with SMEs and technical teams to refine concepts and standards.
• Support knowledge graph development and integration with enterprise data platforms.
• Perform validation, constraint checks, and quality controls for semantic assets.
• Manage ontology changes via version control, reviews, testing, and documentation.
• Develop ontology documentation, modeling patterns, and usage guidance.
• Partner with data engineering, platform, analytics, and AI teams to align knowledge representation.

Skills

Semantic Web standards

Graph databases

Python/Java scripting

Communication skills

Ontology development

Education

Bachelor's degree or equivalent

Tools

Protégé

TopBraid

PoolParty

Stardog

Job description

When you're the best, we're the best. We instill an environment where employees feel engaged, satisfied and able to contribute their unique skills and talents while living and working as their authentic selves. We provide extensive opportunities for personal and professional development, building both employee competence and organizational capability to fuel exceptional performance through an inclusive environment both now and in the future.

Summary: In this role, you will develop and maintain semantic ontologies and models that establish consistent business meaning and enable high-quality, interoperable data across the organization. You will translate business and data concepts into scalable semantic models, support knowledge graph development and integration, and collaborate with product, data, and business clients to ensure semantic assets are documented, governed, validated, and production-ready. You will contribute to the semantic foundation that enables advanced analytics, data products, and AI-enabled solutions.

Responsibilities

• Design, develop, and maintain logical, extensible ontologies, vocabularies, and semantic models aligned with enterprise concepts and analytics and AI needs.
• Translate client use cases into competency questions, semantic requirements, definitions, relationships, and implementable semantic models.
• Collaborate with subject matter experts and technical teams to refine concepts, relationships, modeling patterns, and semantic standards.
• Support knowledge graph development and integration with enterprise data platforms, including semantic-to-data mapping, graph and triplestore implementation, and SPARQL query development.
• Perform logical validation, constraint checks, and quality controls to maintain the accuracy, consistency, and interoperability of semantic assets.
• Manage ontology and semantic model changes through established version control, review, testing, documentation, and release practices.
• Develop and maintain ontology documentation, modeling patterns, standards, and usage guidance for technical and non-technical audiences.
• Partner with data engineering, platform, product, analytics, and AI teams to align knowledge representation with enterprise data systems and implementation requirements.
• Apply foundational and top-level ontologies and industry standards to enterprise use cases while balancing scalability, extensibility, and usability.
• Develop automation, testing, and semantic pipeline integrations using scripting, programming, and software engineering practices.

Qualifications

• Relevant degree preferred. 5 or more years of relevant experience required.
• Hands-on knowledge of Semantic Web standards and technologies, including RDF, OWL, SKOS, SPARQL, and SHACL.
• Experience with graph databases and/or triplestores, including semantic modeling, schema design, and query performance considerations in production environments.
• Experience integrating disparate datasets through common vocabularies, semantic-to-data mapping, and validation.
• Proficiency with ontology development tools and workflows such as Protège, TopBraid, PoolParty, Stardog, or similar technologies.
• Experience applying foundational or top-level ontologies and standards such as BFO, DOLCE, Common Core Ontologies, OBO Foundry, or similar frameworks to enterprise needs.
• Working knowledge of Python, Java, or similar programming languages to support automation, testing, and semantic pipeline integration.
• Experience applying software engineering practices to semantic assets, including Git-based version control, review workflows, automated validation and testing, and CI/CD release practices.
• Strong analytical, problem-solving, and communication skills, with the ability to explain complex semantic concepts clearly to technical and non-technical clients.

Estimated Hiring Range

At Vizient, we consider skills, experience, and organizational needs in our compensation approach. Geographic factors may adjust the range estimate and hires typically fall below the top range. Compensation decisions are tailored to individual circumstances. The current salary range for this role is $102,400.00 to $179,000.00. This position is also incentive eligible.

Vizient has a comprehensive benefits plan!

Equal Opportunity Employer

Females/Minorities/Veterans/Individuals with Disabilities

The Company is committed to equal employment opportunity to all employees and applicants without regard to race, religion, color, gender identity, ethnicity, age, national origin, sexual orientation, disability status, veteran status or any other category protected by applicable law.

Company Overview

Working at Vizient means shaping the future of healthcare, every day. Alongside our clients, we're building a healthier, more human healthcare system. We connect people, data, and solutions to enable healthcare organizations to improve financial sustainability, enhance system performance, and deliver better care.

Headquartered in Irving, Texas, with 11 offices across the United States, Vizient has more than 5,000 employees who bring deep expertise and a shared commitment to transforming healthcare. Together, we're solving some of the industry's most complex challenges while creating opportunities to learn, grow, and drive lasting change for healthcare organizations and the communities we serve.

Through our enterprise of companies, we deliver meaningful impact across the continuum of care: Apexus - The exclusive contractor for 340B Drug Pricing Program, managed by the Health Resources and Services Administration. aptitude - The industry's first online direct contracting market, supporting self-contracting activity between hospitals and suppliers. Kaufman Hall - Leading healthcare advisory services to support our clients in achieving financial, clinical, and operational excellence. Provista - Proven supply chain partner specializing in extended, diagnostic, and preventive care facilities, including surgery centers, home health, and senior living.