Senior Java Backend Developer (English + French or Dutch) | Energy & Utilities
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.
- 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.
Advanced (min. 5 years):
- Java , Spring Boot
- GraphQL
- Apache Kafka
- REST API and SOAP service development
- Asynchronous integration patterns ( event-driven architecture , message queues )
- 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
- AWS (e.g., EKS , SQS , S3); PostgreSQL ; CI/CD pipelines, monitoring and logging in cloud-native environments; Kubernetes
- English - fluent (mandatory) both spoken and written ≥ B2
- Dutch or French - as a secondary language ≥ B1
- 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 .
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