Position Name Graph Engineer

About the profile We are seeking a hands-on Graph Engineer (primarily using Stardog) to design, build, and operate knowledge graph solutions that turn complex, siloed data into a connected, queryable asset for our life science clients. In this role, you will work closely with the Knowledge Management team and client stakeholders to translate data models and business questions into robust, production-grade graph infrastructure. Acting as a technical specialist internally and externally, you will build and maintain Stardog-based knowledge graphs, integrate diverse data sources through modern data engineering pipelines, and ensure the ontologies and data models underpinning our graphs are sound, scalable, and maintainable. You bring strong hands-on experience with Stardog and data engineering, a solid understanding of ontology management concepts (RDF/OWL), and a pragmatic engineering mindset. Experience with Databricks, or in life science IT and regulated environments, is a plus and will be considered a strong asset.

Responsibilities

1. Knowledge Graph Engineering with Stardog

Design, build, deploy, and operate knowledge graphs on Stardog, including data modeling, virtual graphs, and reasoning configuration

Create and maintain Stardog virtual graphs, connecting relational and external data sources to the knowledge graph without physical replication

Design, write, and maintain SMS (Stardog Mapping Syntax) mappings to translate source schemas into RDF, ensuring accuracy, performance, and maintainability

Write and optimize SPARQL queries and Stardog-specific tooling (Stardog Studio, CLI, APIs) for data loading, validation, and troubleshooting

Configure and maintain Stardog security, performance, and scalability settings for production workloads

Monitor, tune,



and troubleshoot graph database performance across ingestion, reasoning, and query layers

2. Data Engineering & Integration

Design and implement data pipelines to ingest, transform, and map source data (relational, document, file-based) into RDF graph structures

Build and maintain ETL/ELT processes, including source-to-target mapping definitions, data quality checks, and automated testing

Integrate the knowledge graph with upstream and downstream systems, APIs, and analytics layers

Apply sound software engineering practices: version control, CI/CD-aware delivery, documentation, and code review

3. Ontology & Data Modeling Support

Apply ontology management concepts (RDF, RDFS, OWL) to implement and maintain data models designed in collaboration with ontologists and business stakeholders

Support ontology versioning, validation (e.g. SHACL), and alignment across data sources

Contribute to documentation of data models, mappings, and graph architecture so others can understand, reuse, and build on the work

Requirements - Must have

Hands-on experience with Stardog (or a comparable enterprise RDF triplestore/graph database)

Solid understanding of Stardog virtual graphs and experience connecting external/relational data sources to a knowledge graph without full data replication

Practical experience creating and maintaining SMS (Stardog Mapping Syntax) mappings

Solid experience in data engineering:



building and operating data pipelines, ETL/ELT, and data integration

Good understanding of ontology management concepts, including RDF and OWL

Comfortable working with SPARQL and graph query optimization

Independent and reliable, able to take ownership of technical topics and drive them forward

Pragmatic, focused on what works in real-world production environments rather than theoretical perfection

Well-organized, documenting your work clearly and digitally so others can understand and reuse it

Comfortable using AI tools, applying them thoughtfully to improve productivity without over-reliance

Requirements - Nice to have

Experience with Azure Stack: ADLSv2, ADF, AKS, etc.

Experience with Databricks (Spark-based data engineering, Delta Lake, notebooks)

Experience in Life Sciences IT, particularly in regulated environments (e.g. GxP, validated systems, data traceability requirements)

Seniority Level Mid

Languages Fluent English written and spoken. Other languages a plus (especially Spanish)

What we offer

Hybrid work model and adaptable working schedule that would suit night owls and early birds.

25 holiday days per year.

Attractive social benefits package.

Opportunities for career development and the opportunity to shape the company's future.

An employee-centric culture directly inspired by employee feedback - your voice is heard, and your perspective encouraged.

Different training programs to support your personal and professional development.

Work in a fast growing, international company.

Friendly atmosphere and supportive Management team.

This is an opportunity to be at the forefront of the semantic data revolution in life …

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📌 Graph Engineer (Madrid)
🏢 MIGx
📍 Madrid