Java Developer - GraphDB & Semantic Web | European Institutions

Edda International; Frankfurt (Oder); Hybrid; EUR 45.000 - 65.000; Vollzeit

Zusammenfassung

An innovative IT services provider is seeking motivated Java Developers to support projects at a prestigious European Institution in Luxembourg. One Junior and one Senior Developer are needed. Responsibilities include designing Java applications, optimizing SPARQL queries, and managing development pipelines. Candidates should have strong Java experience and familiarity with GraphDB technologies. This is a permanent role with flexible work models including remote options for seniors. Relocation may be required for full on-site positions.

Qualifikationen

• Strong experience in Java development.
• Hands-on experience with SPARQL, RDF, and GraphDB technologies.
• Understanding of front-end/back-end data flow.

Aufgaben

• Design and develop scalable Java applications integrated with GraphDB technologies.
• Write and optimize SPARQL queries.
• Develop and maintain ETL processes.

Kenntnisse

Java development

SPARQL

GraphDB technologies

Elastic Search

CI/CD

Independent work

Jobbeschreibung

WHO WE ARE

Edda International, a dynamic and rapidly growing European group of companies with an estimated 2024 turnover of 20+ MEUR, 220+ employees and 15+ years of experience. Operating out of Luxembourg and Brussels, Edda International manages large International Institutions Framework Contracts delivering Information Technology services throughout geographical Europe.

WHAT WE ARE LOOKING FOR

Java Developer – GraphDB & Semantic Web | European Institutions

We are currently looking for two highly motivated Java Developers to support our client’s projects at a prestigious European Institution in Luxembourg (Kirchberg). The mission involves working with graph databases and semantic web technologies, driving innovation in data representation, retrieval, and UI integration.

We are hiring for :

• 1 Junior Developer (1–4 years of experience) – full-time onsite
• 1 Senior Developer – flexible model: onsite, near-site (within 2h travel) or remote (minimum 20% onsite)

In these roles, you will contribute to software development activities in the domain of semantic web, data visualization, and search technologies used by one of the most influential institutions in Europe.

YOUR TASKS

• Design and develop scalable Java applications integrated with GraphDB technologies
• Write and optimize SPARQL queries
• Develop and maintain ETL processes for existing and new tools
• Implement new features and extend internal applications built with Java and graph databases
• Create and integrate UI filters, data presentation layers, and backend services
• Manage different development environments and CI / CD pipelines
• Contribute to architectural decisions and evaluate technology options
• Optionally, support front-end styling and interaction
• Collaborate with institutional stakeholders on product improvements
• Support Proof-of-Concept (PoC) creation and adaptive development

YOUR SKILLS AND EXPERIENCE

• Strong experience in Java development
• Hands‑on experience with SPARQL, RDF, and GraphDB technologies (e.g., Ontotext, Blazegraph, etc.)
• Familiarity with semantic web concepts such as OWL and SHACL is a strong asset
• Proficiency with Elastic Search is a plus
• Capable of working independently and proactively
• Understanding of front‑end / back‑end data flow
• CI / CD and versioning experience (e.g., Git, Jenkins)
• Previous experience in EU institutions is a plus

Bonus: project management experience or familiarity with institutional workflows

EXTRA INFORMATION

• Contract type: Permanent employment or freelance
• Start date: September / October 2025
• Location: Luxembourg (Kirchberg)

Work mode

• Junior : On-site, 5 days / week
• Senior : On-site or near-site (within 2 hours from Kirchberg) or remote with minimum 20% onsite

Relocation required if beyond 2h travel from Kirchberg for full on-site positions. At Edda International, we are committed to supporting a Diverse and Inclusive Community. This position is open to EU citizens or non‑EU citizens already residing in the EU with a valid work permit, due to the sensitive nature of institutional data.