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Semantic Web Developer Jobs (NOW HIRING)

CELESTAR

Lead Ontologist - OBIQUA

Reston, VA · On-site

... semantic web technologies and standards, including RDF, OWL, SPARQL, and related ontology engineering methodologies. • Develop semantic data models and knowledge representation frameworks to ...

The Talent Mine

Ontology Engineer

Dallas, TX

Stay current with advancements in knowledge representation, semantic web technologies, and AI/ML techniques. Minimum Requirements: * 3+ years of experience in ontology engineering, knowledge graph ...

TetraScience

Data & Semantic Model Architect

$65.25 - $84/hr

Empower Forward Deployed Engineering: Create the data contracts and standardized definitions that ... Deep, hands-on expertise with semantic web standards (RDF, OWL, SHACL, SPARQL) and property graph ...

The Talent Mine

Ontology Engineer

Dallas, TX

Stay current with advancements in knowledge representation, semantic web technologies, and AI/ML techniques. Minimum Requirements: * 3+ years of experience in ontology engineering, knowledge graph ...

Jobsbridge

Lead UI Developer

Palo Alto, CA

$68.50 - $87.50/hr

ANGULAR and Node.JS Strong knowledge in using Object Oriented Programming concepts Experienced in ... web page designs and mockups into semantic HTML/ CSS/ JS Extensive experience in jQuery and AJAX ...

Jobsbridge

LEAD UI Developer

Palo Alto, CA

$68.50 - $87.50/hr

... web page designs and mockups into semantic HTML/ CSS/ JS Extensive experience in jQuery and AJAX ... Qualifications javascript , HTML 5 , CSS 3 , JQUERY, Web developer Additional Information Multiple ...

Jobsbridge

LEAD UI Developer

Sunnyvale, CA

$68.25 - $87.50/hr

... web page designs and mockups into semantic HTML/ CSS/ JS Extensive experience in jQuery and AJAX ... Qualifications javascript , HTML 5 , CSS 3 , JQUERY, Web developer Additional Information Multiple ...

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Semantic Web Developer information

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$49.5K

$117.9K

$241K

How much do semantic web developer jobs pay per year?

As of Jul 6, 2026, the average yearly pay for semantic web developer in the United States is $117,880.00, according to ZipRecruiter salary data. Most workers in this role earn between $80,000.00 and $128,000.00 per year, depending on experience, location, and employer.

What is a Semantic Web Developer?

A Semantic Web Developer is a software professional who creates applications and systems that leverage the Semantic Web, a set of technologies designed to make data on the internet machine-readable and interoperable. They use standards like RDF (Resource Description Framework), OWL (Web Ontology Language), and SPARQL to structure data and enable intelligent data integration and sharing. Semantic Web Developers often work on projects involving linked data, knowledge graphs, and artificial intelligence to enhance how information is connected and understood by machines. Their work helps improve search, data discovery, and automation across diverse domains.

What are the key skills and qualifications needed to thrive as a Semantic Web Developer, and why are they important?

To thrive as a Semantic Web Developer, you need a solid background in computer science, expertise in semantic technologies (such as RDF, OWL, and SPARQL), and experience with web development languages like JavaScript or Python. Familiarity with ontology editors (like Protégé), triple stores (such as Apache Jena or Virtuoso), and relevant W3C standards is typically required. Strong analytical thinking, problem-solving skills, and the ability to communicate complex concepts clearly set outstanding candidates apart. These competencies are vital for building interoperable, intelligent web systems that efficiently manage and leverage structured data.

What is the difference between Semantic Web Developer vs Web Developer?

AspectSemantic Web DeveloperWeb Developer
Required SkillsSemantic web technologies, RDF, OWL, SPARQL, ontologiesHTML, CSS, JavaScript, frameworks like React or Angular
Work EnvironmentResearch, data integration, knowledge graphsWebsite and application development
Industry UsageData-driven industries, AI, knowledge managementMedia, e-commerce, corporate websites

Semantic Web Developers focus on creating intelligent, data-rich web applications using semantic technologies, while Web Developers primarily build and maintain standard websites and applications. Both roles require coding skills, but their focus areas differ significantly, with Semantic Web Developers working more with data integration and ontologies.

What are the most common challenges faced by Semantic Web Developers when integrating ontologies with existing data sources?

Semantic Web Developers often encounter challenges when mapping and integrating diverse data sources into a unified ontology. These can include inconsistencies in data formats, incomplete metadata, and aligning different vocabularies or schemas. Overcoming these issues typically requires strong analytical skills, familiarity with RDF and OWL standards, and close collaboration with data owners and subject matter experts to ensure semantic accuracy. Regular communication and iterative testing are essential for successful integration and to maintain data integrity across systems.
More about Semantic Web Developer jobs
What job categories do people searching Semantic Web Developer jobs look for? The top searched job categories for Semantic Web Developer jobs are:
Semantic Web Developer jobs near you
Infographic showing various Semantic Web Developer job openings in the United States as of June 2026, with employment types broken down into 81% Full Time, 12% Part Time, and 7% Contract. Highlights an 73% Physical, 4% Hybrid, and 23% Remote job distribution, with an average salary of $117,880 per year, or $56.7 per hour.
Lead Ontologist - OBIQUA with Security Clearance

Lead Ontologist - OBIQUA with Security Clearance

CELESTAR CORPORATION

Reston, VA • On-site

$106K - $140K/yr

Other

Medical, Dental, Life, Retirement, PTO

Posted 26 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 (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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