Principal Ontologist

About Us

Red Arch Solutions empowers mission‑driven organizations by delivering innovative, scalable, and secure technical solutions. Our team thrives on collaboration, technical excellence, and accelerating our customers' growth goals.

Principal Ontologist – We are seeking a Principal Ontologist to support the deployment and integration of Progress Semaphore, a semantic AI platform, within a large‑scale enterprise data modernization initiative. This role will focus on developing and applying ontologies to unify and enhance data across mission support domains such as human resources, logistics, acquisitions, and IT governance.

The ideal candidate will bring deep expertise in knowledge representation, semantic technologies, and ontology engineering, and will collaborate with data architects, software engineers, and business stakeholders to ensure semantic consistency and interoperability across diverse data sources.

• Lead the design, development, and implementation of ontologies to support enterprise data integration and semantic enrichment.
• Collaborate with stakeholders to elicit domain knowledge and translate it into formal ontological models.
• Support the configuration and deployment of Progress Semaphore, including taxonomy and ontology management, semantic annotation, and rules‑based classification.
• Ensure alignment with enterprise data governance frameworks and standards.
• Work closely with software engineering teams to integrate ontologies into data pipelines, knowledge graphs, and semantic search applications.
• Provide guidance on semantic modeling best practices and mentor junior ontologists or data modelers.

• Proficiency in OWL2, RDF(S), and SPARQL.
• Experience with ontology editors such as Protégé or Top Braid Composer.
• Demonstrated ability to build domain ontologies based on upper ontologies (e.g., CCO, BFO).
• Familiarity with triple stores, graph databases, and knowledge graph architectures.
• Experience applying ontologies to support data normalization, integration, and semantic search.
• Strong communication skills and ability to work across multidisciplinary teams.
• Experience supporting enterprise data initiatives in mission support domains (HR, logistics, etc.).

• Experience with Progress Semaphore or similar semantic platforms.
• Familiarity with W3C standards such as SOSA/SSN, Time Ontology, or SKOS.
• Background in natural language processing, data classification, or semantic enrichment.
• Coursework or experience in data structures, algorithms, logic, or software engineering.
• Understanding of data governance, metadata management, and enterprise architecture.

• U.S. Citizenship.
• Ability to obtain and maintain a Top Secret clearance with SCI access and polygraph.

Other work locations may be available for this opening. Apply directly to connect with the recruiting team or reach out to  for more information.