Senior Software Engineer – Semantic Graph Studio

NextLink Group; Sant Cugat del Vallès; On-site; EUR 55,000 - 75,000; Full time

Job summary

NextLink Group is seeking a Senior Software Engineer to advance an Enterprise Knowledge Graph (EKG) platform and EKG Studio, built on Metaphactory. You will join an international Agile team, owning semantic modeling, data integration, governance, and scalable backend/frontend work.

Key focus areas include RDF/OWL, SPARQL, R2RML mappings, and securing multi-tenant environments. Excellent collaboration and communication in English are required.

Qualifications

• Experience with Semantic Web and Knowledge Graph development.
• Proficiency in RDF/OWL and SPARQL with semantic validation and graph integration.
• Hands-on mapping with R2RML/RML for relational-to-RDF data.
• Experience with graph databases and SPARQL optimization.
• Familiarity with Git, CI/CD pipelines, Jenkins, Docker/Podman and OpenShift/Kubernetes.
• Fluent English, written and spoken.

Responsibilities

• Fullstack Development: design, develop, and maintain EKG Studio components, UI templates, backend plugins, and workflows.
• Semantic Modeling & Integration: implement mappings, integrate relational data with RDF graphs, support ontology management.
• CI/CD & Governance: automate Git workflows, semantic validation, testing, deployments across OpenShift.
• Security & Access Management: implement RBAC, OAuth, multi-tenant governance controls.
• Performance Optimization: optimize SPARQL queries, graph search, indexing, UI responsiveness.
• Technical Ownership: collaborate with Agile teams and support production releases and documentation.

Skills

RDF & OWL

SPARQL

SHACL

Ontology modeling

R2RML/RML

Graph databases

Git & CI/CD

Docker/Podman

OpenShift/Kubernetes

English proficiency

Job description

NextLink Group is seeking a Senior Software Engineer to advance an Enterprise Knowledge Graph (EKG) platform and EKG Studio, built on Metaphactory. You will join an international Agile team, owning semantic modeling, data integration, governance, and scalable backend/frontend work.

Key focus areas include RDF/OWL, SPARQL, R2RML mappings, and securing multi-tenant environments. Excellent collaboration and communication in English are required.