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Ontologist Jobs in Washington (NOW HIRING)

CELESTAR

Lead Ontologist - OBIQUA

Reston, VA · On-site

Celestar Corporation is seeking a Lead Ontologist to support the Defense Intelligence Agency ( DIA) under the Object Based Intelligence and Quality Assurance (OBIQUA) task order. The primary place of ...

Johns Hopkins Applied Physics Laboratory

Ontologist

Laurel, MD · On-site

$171K - $203K/yr

Description Are you passionate about building solutions for our greatest national security challenges? Are you searching for engaging work with an employer that prioritizes impact, innovation, and ...

Peraton

Ontologist - System Integrator

Springfield, VA · On-site

Responsibilities Expert Systems Integrators support the Government by leading and overseeing the integrity of the NSG/ASG systems-of-systems enterprise. They lead and oversee planning, implementation ...

Peraton

Ontologist - System Integrator

Springfield, VA · On-site

$146K - $234K/yr

Responsibilities Expert Systems Integrators support the Government by leading and overseeing the integrity of the NSG/ASG systems-of-systems enterprise. They lead and oversee planning, implementation ...

Vantor

Ontology Engineer (TS/SCI with CI Poly)

Herndon, VA · On-site

$137K - $200K/yr

The Lead Ontologist serves as the technical authority for the design, development, and maintenance of domain-specific ontologies and knowledge models that support Object-Based Intelligence (OBI ...

Vantor

Ontology Engineer (TS/SCI)

Herndon, VA · On-site

$137K - $200K/yr

The Lead Ontologist serves as the technical authority for the design, development, and maintenance of domain-specific ontologies and knowledge models that support Object-Based Intelligence (OBI ...

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Ontologist information

What are the key skills and qualifications needed to thrive as an ontologist?

To thrive as an Ontologist, you need a solid background in information science, knowledge representation, and formal logic, typically supported by a degree in computer science, information systems, or a related field. Experience with semantic web technologies (such as RDF, OWL, and SPARQL), ontology management tools (like Protégé), and sometimes certification in data modeling or knowledge engineering is highly valuable. Strong analytical thinking, problem-solving abilities, and effective communication skills make an ontologist stand out. These competencies are critical for designing and maintaining data structures that improve organizational understanding, interoperability, and searchability of information.

How to become an ontologist?

To become an ontologist, typically a bachelor's degree in computer science, information science, philosophy, or a related field is required, often followed by specialized training or certification in ontology development and semantic technologies. Gaining experience with tools like OWL, RDF, and knowledge modeling, along with strong analytical and logical skills, is essential for this role.

What does an ontologist do?

An Ontologist designs and manages structured frameworks for organizing information, such as taxonomies, ontologies, and metadata schemas. They work to ensure data is meaningfully categorized and interconnected, improving search, retrieval, and interoperability across systems. Ontologists often collaborate with data scientists, engineers, and subject matter experts to develop semantic models that enhance AI, machine learning, and knowledge management applications.

What are the most commonly searched types of Ontologist jobs in Washington? The most popular types of Ontologist jobs in Washington are:
What are popular job titles related to Ontologist jobs in Washington? For Ontologist jobs in Washington, the most frequently searched job titles are:
What job categories do people searching Ontologist jobs in Washington look for? The top searched job categories for Ontologist jobs in Washington are:
What cities in Washington are hiring for Ontologist jobs? Cities in Washington with the most Ontologist job openings:
Ontologist jobs near you
Infographic showing various Ontologist job openings in Washington as of August 2026, with employment types broken down into 80% Full Time, and 20% Contract. Highlights an 85% In-person, and 15% Remote job distribution.

Lead Ontologist - OBIQUA

CELESTAR

Reston, VA • On-site

Full-time

Medical, Dental, Life, Retirement, PTO

Re-posted 5 days ago

Job description

Celestar Corporation is seeking a Lead Ontologist to support the Defense Intelligence Agency (DIA) under the Object Based Intelligence and Quality Assurance (OBIQUA) task order. The primary place of performance will be at DIA Facilities across the National Capital Region (NCR). If interested and meet the qualifications, we encourage you to apply for this rewarding and impactful opportunity.
ANTICIPATED AWARD: October 2026
ANTICIPATED START: October 2026
PERIOD OF PERFORMANCE: 1 Base Year + 4 Option Years
LOCATION: DIA Facilities across the National Capital Region (NCR)
CLEARANCE REQUIREMENT: Active TS/SCI with a Current CI Poly (adjudicated within the last 5 years)
About Us:
Celestar, a B&A Company, offers highly competitive salaries and benefits. Our comprehensive benefits package includes company-paid employee and family dental insurance, employee health insurance, life insurance, and disability coverage. Additionally, we provide a 401(k)-retirement plan with company matching, paid holidays, and personal time off.
Responsibilities:
This opportunity supports DIA's Object Based Intelligence and Quality Assurance (OBIQUA) initiative focused on advancing intelligence analysis through Agile program management, AI assurance, analytic innovation, and ontology development.
• The Lead Ontologist is responsible for the development of domain-specific ontologies.
• This position leads the application of semantic web standards (e.g., RDF, OWL, SPARQL) and government data standards to enable semantic representation of data inputs, facilitating integration and interoperability across intelligence systems.
• Design, develop, and maintain domain-specific ontologies supporting intelligence and data integration initiatives.
• Apply semantic web technologies and standards, including RDF, OWL, SPARQL, and related ontology engineering methodologies.
• Develop semantic data models and knowledge representation frameworks to support interoperability across intelligence systems.
• Collaborate with data architects, AI engineers, analysts, and Government stakeholders to ensure alignment with mission requirements.
• Support data integration, discovery, and knowledge management efforts through ontology-driven solutions.
• Provide technical leadership and guidance on ontology development, semantic technologies, and emerging industry best practices.
Required Qualifications:
• Demonstrated senior-level expertise in developing and implementing ontologies for complex data systems.
• Experience with semantic web technologies and standards including RDF, OWL, SPARQL, SHACL, or related ontology engineering tools.
• Desired Experience: Minimum 12 years of experience related to the specific labor category with at least a portion of the experience within the last 2 years.
• Desired Education: Master's degree in an area related to the labor category from a college or university accredited by an agency recognized by the U.S. Department of Education; or have Bachelor's degree related to the labor category from a college or university accredited by an agency recognized by the U.S. Department of Education and an additional 5 years of related senior experience, for a total of 17 years, as a substitute to the Master's degree
Come on board with a company that Values its Employees!
Celestar Corporation is an Equal Opportunity Employer. The Celestar Corporation prohibits discrimination, harassment, and retaliation in employment based on race; color; religion; genetic information; national origin; sex (including same-sex); sexual orientation; gender identity; pregnancy, childbirth, or related medical conditions; age; disability or handicap; citizenship status; marital status; service member/protected veteran status; or any other category protected by federal, state, or local law.

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