Java Developer - GraphDB & Semantic Web | European Institutions

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 / backend 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.