Senior Java Backend Developer (English + French or Dutch) | Energy & Utilities

Edda International; Paris; Hybride; EUR 80 000 - 100 000; Temps partiel

Résumé du poste

A leading European technology firm based in France is seeking a Senior Java Backend Developer fluent in English and French or Dutch. The role focuses on developing and maintaining API-enabled Domain Services using Java and Spring Boot. Candidates should have a minimum of 5 years in relevant technologies and be comfortable working in agile teams. This is a freelance position with a mix of on-site work in Brussels and remote flexibility.

Qualifications

• Mandatory expertise in Java, Spring Boot, GraphQL, and Apache Kafka.
• Fluent in English, with Dutch or French as a secondary language.
• 5 years (Advanced) or 8 years (Expert) experience required.

Responsabilités

• Deliver and evolve Java/Spring Boot services for integration use cases.
• Design and implement REST APIs and SOAP services.
• Collaborate within agile teams to support business priorities.

Connaissances

Java

Spring Boot

GraphQL

Apache Kafka

REST API and SOAP service development

Asynchronous integration patterns

Outils

Docker

Kubernetes

Description du poste

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

Senior Java Backend Developer (English + French or Dutch)

We are currently looking for multiple profiles - Advanced (6) and Expert (1) - with proven Java / Spring Boot and integration expertise to join our client’s projects in Brussels in the energy & utilities domain.

The mission involves delivering API-enabled Domain Services and integrations, including REST / SOAP services, GraphQL, and event-driven patterns with Kafka within agile squads / chapters.

In this role, you will :

Analyse, develop and maintain functionalities across Java-based Domain Services, with a focus on REST / SOAP APIs, GraphQL, and asynchronous / event-driven integration patterns (e.g., message queues, Kafka).

Work within agile squads / chapters to support business priorities and integration objectives.

Expert track :

guide other developers, perform quality controls, produce detailed designs for Java-based Domain Services, and advise on general integration topics; may also contribute to JavaScript applications and CMS components where required.

YOUR TASKS

Deliver and evolve Java / Spring Boot services for integration use cases.

Design and implement REST APIs and SOAP services; contribute to GraphQL integrations.

Implement asynchronous / event-driven patterns with Apache Kafka and message queues.

Collaborate within agile teams (squads / chapters) to support business priorities.

Expert track :

perform code / design reviews, guide / coach peers, produce detailed designs for Domain Services, and advise on integration best practices; contribute to JavaScript / TypeScript apps and CMS components when applicable.

YOUR SKILLS AND EXPERIENCE

Specific expertise (mandatory) :

• Java, Spring Boot
• GraphQL
• Apache Kafka
• REST API and SOAP service development
• Asynchronous integration patterns (event-driven architecture, message queues)

Advanced (min. 5 years) :

• Java, Spring Boot
• GraphQL
• Apache Kafka
• REST API and SOAP service development
• Asynchronous integration patterns (event-driven architecture, message queues)

Expert (8+ years, incl. leadership & setup) :

Java 11 / 17 (5y), Spring / Spring Boot (5y), Spring MVC (2y)

REST API design (5y), JAX-WS / JAX-RS (3y), XML processing (2y), SOA principles (3y)

JavaScript / TypeScript (5y); Vue.js 2 (1y); responsive HTML / CSS (1y) for related application / CMS components

Hands‑on cloud deployments : Microsoft Azure / Azure DevOps, Docker, Kubernetes (5y); able to guide others and perform quality controls; produce detailed designs for Java-based Domain Services and advise on integration topics

Additional strong knowledge in :

• AWS (e.g., EKS, SQS, S3)
• PostgreSQL
• CI / CD pipelines, monitoring and logging in cloud-native environments
• Kubernetes

LANGUAGES :

• English - fluent (mandatory) both spoken and written ≥ B2
• Dutch or French - as a secondary language ≥ B1

ADDITIONAL INFORMATION

Contract type : Freelance

Start date : 17‑24 / 11 / 2025

Location : Brussels, Belgium

Work mode : 2 days per week on-site in Brussels, Belgium

Relocation : Relocation is required for candidates who do not yet reside in Belgium or its border region.

Levels of seniority

• Advanced : min. 5 years of experience
• Expert : 8+ years, including leadership and setup experience

Eligibility : Open to EU citizens and non‑EU citizens already residing in the EU with a valid work permit.

APPLICATION PROCESS

If this opportunity excites you, please send your CV to Edda International. Applications will be processed confidentially. Only selected candidates will be contacted for the next steps.

DIVERSITY AND INCLUSION

At Edda International, we are committed to supporting a Diverse and Inclusive Community.