About the profile

We’re looking for a Data Engineer specialised in knowledge graphs and semantic technologies to join our growing Data and AI Engineering team of professionals who thrive at the intersection of data, technology, and healthcare. This is a hands‑on role for someone who can take ownership of a semantic layer end to end — shaping the approach with clients and colleagues, not just implementing a specification handed to them.

At MIGx, you’ll build knowledge graphs in Stardog that connect fragmented life science data — across research, clinical, regulatory and operational domains — into models that people and machines can actually reason over. You’ll work alongside our data platform and AI engineers, contributing the semantic backbone to modern data mesh and data fabric architectures.

Responsibilities
- Design, build and evolve knowledge graphs in Stardog , from conceptual model through to production deployment.
- Model domain ontologies, taxonomies and vocabularies using RDF, RDFS, OWL and SKOS , and enforce them with SHACL constraints.
- Write,



optimise and troubleshoot SPARQL queries, rules and inference over large graphs.
- Integrate heterogeneous sources into the graph using virtual graphs and mappings (R2RML and similar) from relational databases, APIs, files and semi-structured data.
- Run discovery sessions with subject matter experts , turning business questions into competency questions and a defensible semantic model.
- Align internal models with life science standards and public ontologies , and manage identifier mapping and entity resolution across sources.
- Automate graph builds, tests and deployments through CI/CD pipelines and Python tooling.
- Embed data quality, validation and reconciliation checks into the graph lifecycle.
- Document models and enable others — governance, lineage, and reusable semantic assets that outlive the project.
- Work in agile teams, contributing to standups, retrospectives, and continuous improvement.

Require

📌 Data Engineer (Barcelona)
🏢 MIGx
📍 Barcelona