Data Scientist - European Agency

Altia; Brussel; On-site; EUR 90,000 - 130,000; Full time

Benefits offered by this job

Career Plan

Training Plan

Flexible Remuneration

Job summary

Altia is seeking a Senior Data Scientist / Semantic Data Engineer focused on semantic data, Linked Data, ontology engineering, and knowledge graphs. You will design and implement data solutions based on semantic technologies for international projects supporting European institutions.

Responsibilities include building and maintaining ontologies, knowledge graphs, and data ingestion pipelines, with emphasis on interoperability and semantic enrichment across heterogeneous sources.

Qualifications

• Experience with semantic data, ontologies, and knowledge graphs.
• Ability to translate business needs into semantic data solutions.
• Collaborative work with technical and non-technical stakeholders.

Responsibilities

• Design and implement semantic data solutions, ontologies, and vocabularies.
• Design and maintain knowledge graphs; optimize SPARQL queries and SHACL validations.
• Develop ETL/ELT pipelines to ingest data from multiple sources into RDF environments.
• Implement Linked Data solutions using RDF standards and mapping technologies.

Skills

Semantic data concepts

Stakeholder communication

Data modelling

Tools

RDF / OWL

SPARQL

SHACL

Linked Data technologies

Python

ETL/ELT

Virtuoso/GraphDB

QLever

Job description

Role

We are looking for a Senior Data Scientist / Semantic Data Engineer specialised in semantic data, Linked Data, ontology engineering, and knowledge graphs, responsible for designing and implementing data solutions based on semantic technologies.

Who We Are

Altia is a high-value digital transformation services company that has undertaken, changed, and reformulated international projects for nearly a thousand clients, leaders in their sectors, who have understood that their businesses can be revolutionized through digitalization. Over its 30 years of experience, it has proven to be a robust company with a future, a capacity for innovation, and adaptability.

The project

You will contribute to semantic data and knowledge graph activities within an international project supporting European institutions and agencies, helping transform heterogeneous information sources into interoperable, reusable, and semantically enriched data solutions.

• Semantic Data & Ontologies: Design and align data models and ontologies, develop controlled vocabularies, and manage their lifecycle to ensure consistency and interoperability.
• Knowledge Graphs: Design and maintain knowledge graphs, develop and optimise SPARQL queries, and validate semantic data models using SHACL.
• Data Ingestion & Transformation: Develop ETL/ELT pipelines to ingest, transform, and publish data from relational databases, XML, JSON, CSV, and APIs into RDF-based environments.
• Linked Data Engineering: Implement Linked Data solutions and semantic transformations using established RDF standards and mapping technologies.
• Functional & Technical Collaboration: Translate business requirements into technical specifications and communicate complex semantic data concepts and results effectively to both technical and non-technical stakeholders.

Stack

• Semantic Web & Linked Data: RDF, RDFS, OWL, SKOS, SHACL, JSON-LD, Turtle, RDF/XML, Linked Data.
• Querying & Knowledge Graphs: SPARQL, knowledge graph modelling and optimisation, QLever, Virtuoso, GraphDB.
• Ontology Engineering: Ontology alignment, vocabulary design, ontology lifecycle management, semantic modelling.
• Data Engineering: Python, ETL/ELT, RML, data ingestion and transformation from relational, XML, JSON, CSV and API sources.
• Validation & Interoperability: SHACL, semantic data validation, RDF mappings and Linked Data interoperability.

What we offer

• High-impact project
• Collaborative work environment
• Career Plan
• Training Plan
• Flexible Remuneration

The present job offer is drafted taking into account impartiality and non-discrimination on the grounds of gender, race, ideology, or any other reason. Especially, it takes into account the respect for the current regulations regarding gender equality between women and men (Royal Decree-Law 6/2019).