JOB TITLE: SENIOR JAVA DEVELOPER
LANGUAGES REQUIRED: ENGLISH
WORK LOCATION: BRUSSELS, BELGIUM
WORK MODE: HYBRID (2 DAYS/WEEK ONSITE)
CONTRACT DURATION: 29/06/2026 - 31/12/2026
JOB DESCRIPTION
We are seeking a Senior Java Developer to lead the design, development, and maintenance of backend components and RESTful APIs supporting enterprise-grade applications.
The ideal candidate combines deep technical expertise with strong collaboration skills, ensuring robust, scalable, and maintainable solutions.
Key Responsibilities
- Design, develop, and maintain backend services and REST APIs using Java and Spring Boot.
- Ensure code quality through unit, integration, and performance testing.
- Conduct code reviews, promote best practices, and mentor junior developers.
- Collaborate with architects, analysts, and DevOps engineers to define and refine technical solutions.
- Support deployment, cutover, and hypercare phases, ensuring stable releases.
- Troubleshoot and resolve production issues, ensuring system performance and reliability.
- Maintain and update technical documentation for services, configurations, and interfaces.
- Contribute to technical design discussions, ensuring alignment with architectural principles and cloud strategy.
Conformity Criteria
- A minimum of 10 years working experience as a Java developer
- Demonstrable experience -minimum 5 years with microservices architecture
- Demonstrable working experience with integration with SAAS solutions
- Demonstrable experience -minimum 5 years with Spring framework
- Minimum 2 days per week onsite
- C1 level (or equivalent) proficiency in spoken and written English
Evaluation criteria
- Core Java Proficiency: Uses OOP, collections, streams, and exception handling effectively
- Frameworks & Libraries: Applies Spring Boot, JPA/Hibernate, Maven/Gradle, testing frameworks
- API Design & Integration: Designs clean, reusable REST APIs, respects standards and security
Key Skills
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- Posted
- May 14, 2026
- Type
- Full-time
- Level
- Mid-Senior
- Location
- Brussels
- Company
- OneSource Consulting
Industries
Categories
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