Senior Ontologist / Semantic Knowledge Engineer- European Union – Full Remote in Lisboa, Lisboa at IRIUM

At IRIUM we want you to always chase your dreams. Here, prepare yourself to conquer your goals, while enjoying the journey.

We are currently looking for: Senior Ontologist

Requirements:

We are currently looking for a Senior Ontologist to join an international project, contributing to the design, development, and maintenance of ontologies that support Knowledge Graph, semantic enrichment, data integration, and knowledge management initiatives.

Required Competencies:

• Minimum 5 years of experience in ontology design, development, and semantic technologies
• Strong experience designing, implementing, and maintaining ontologies and taxonomies independently
• Expert knowledge of Semantic Web and W3C standards:
  • RDF / RDFS
  • OWL
  • SKOS
  • SHACL
  • SPARQL
• Strong knowledge of Datalog or other inferencing rule languages
• Experience with standard serialization formats, including Turtle (TTL) and JSON-LD
• Experience analysing different data formats, including JSON and Excel, for semantic integration
• Experience with ontology development tools such as metaphactory and RDFox
• Strong experience with Git, including branching, merging, and reviewing ontology-related changes
• Knowledge of ontology and taxonomy development best practices and methodologies
• Ability to ensure semantic accuracy, consistency, and quality across ontology models
• Ability to work independently with minimal supervision
• English proficiency – C1/C2

Soft Skills:

• Strong analytical and problem-solving skills
• Ability to analyse complex issues, evaluate trade-offs, and implement effective solutions
• Excellent attention to detail and semantic consistency
• Strong communication skills, with the ability to explain complex concepts clearly
• Ability to collaborate effectively with technical and business stakeholders
• Strong ability to drive consensus among different stakeholders
• Autonomous and proactive mindset
• Ability to work effectively in an international and collaborative environment

Location: European Union – Full Remote

Gross salary range
€3,800–€4,300 monthly

Note: Includes all components: Fixed, Variable, Meal Allowance, Remote Work, and Benefits.

What do we offer?

➡ An innovative and growing company, with a lot of opportunities for professional development.

➡ Retribution according to your experience and performance. Access to flexible pay and medical insurance as a social benefit.

➡ Unlimited access to technological training in free mode.

IRIUM is a company with dynamic and proactive professionals. Our values are responsibility and commitment to work quality. This is the spirit we are looking for at IRIUM, whatever your age is. If you recognize yourself in this, this is your company!

We can build the future together. Let’s talk!

Send your CV to: recrutamento@irium.pt

At IRIUM we defend a world without stereotypes or limitations and we believe in equality for all, principles that we subscribe to in our Equality Plan and Code of Ethics, guaranteeing equal treatment and opportunities regardless of any personal, physical or social condition.