Senior Java Developer Full Stack

Start Date: As soon as possible

End Date: 31/12/2025

Duration: 9 months (full-time)

Location: Avenue Fonsny, 20 - 1060 Brussels

Remote Work: Homeworking is possible (3-4 days a week)

Context and Description:

In the context of a major business transformation program, we are looking for a Senior Java Developer to reinforce the existing teams, with a focus on architectural tasks and insights. The candidate must be willing and able to assist architects in addition to senior development tasks, including designs, reviews, coaching, and deployments. As a Senior Developer, you will join a department of about 70 people to ensure the hand-over, refactoring, or greenfield development of new business applications. You will be responsible for Java application development, supporting analysts and business objectives while providing expertise in the full software development lifecycle, from concept and design to testing.

Responsibilities:

• Development and maintenance of business applications
• Develop application components/web services
• Contribute to the design of component architecture and building blocks in close collaboration with technical leads or senior software architects
• Coach co-workers on a technical level when needed
• Participate in technical working groups, progress meetings, and meetings with users if needed
• Assist in testing, technical documentation, deployment, evaluation, and reporting (JUnit, JIRA)

Experience Required:

• Minimum 8-10 years of full-time professional Java Development experience (Fullstack preferred - backend with good affinity for frontend is acceptable)
• Familiarity with multi-system integration and complex environments
• Experience with coaching and reviewing peers/junior developers

Competencies:

• Technical knowledge and practical experience with:
  • Java and Spring Framework
  • JPA (with Hibernate as implementation)
  • Security patterns (Spring Security)
  • SOAP and RESTful Web Services
  • Spring Batch
  • SOA, microservices, CQRS
  • Test-driven development (JUnit, Spring, CI, Mockito, Cypress, Selenium)
  • Frontend (HTML/CSS/JavaScript, Angular) & backend abilities
  • Maven, Jenkins, Docker, Openshift, SVN or GIT, Eclipse or IntelliJ, Sonar, JBoss, Tomcat
  • Relational database and O/R mapping, PostgreSQL, SQL Server, Oracle
  • Ability to read and understand BPMN, UML & documentation practices
  • Jira/Confluence
• Familiar with AGILE/SCRUM methodologies, test-driven development, and continuous integration
• Solution and customer-oriented
• Ability to integrate easily into an existing team and supervise juniors

Languages:

• French or Dutch: Active knowledge (understanding/speaking/writing technical documentation/reading) of one language
• English: Active knowledge for written and team communication

Mission & Working Hours:

This is an initial contract with the potential for extension beyond 2025. The working hours are 5 days a week, from Monday to Friday.