Job description

We are seeking a Senior Software Engineer (Java / Spring Boot) to strengthen their development team and contribute to the architecture and evolution of mission-critical backend services. As a senior team member, you will contribute to shaping the technical foundation of Europe’s digital future.

Key Responsibilities:
• Design the backend architecture and define how components such as user interfaces, internal tools, and external applications interact with the backend, with a focus on reliability, resilience, and recovery.
• Build services following microservices architecture principles and align with the Twelve-Factor App methodology for scalable, maintainable applications.
• Develop, optimize and maintain high-quality backend systems using Java, Spring Boot, and modern development practices.
• Contribute to solution architecture, applying patterns such as event-driven design, Saga, CQRS, and domain-driven design.
• Design secure, scalable APIs and support data model evolution.
• Model and manage data using relational databases, especially PostgreSQL, ensuring consistency, performance, and maintainability of the persistence layer.
• Actively participate in Agile ceremonies such as planning, estimation, reviews, and retrospectives.
• Lead technical design discussions and promote clean code, test-driven development, and automation.
• Contribute to system modeling activities using appropriate standards (e.g. UML, ArchiMate) to describe services, integrations, and data flows.
• Collaborate with product owners, business analysts, the service delivery manager, and the enterprise architect for planning activities and refining functional and non-functional requirements.
• Work closely with DevOps and Security teams to ensure compliance with best practices and relevant regulations (e.g. NIS2, GDPR).
• Provide mentorship to the team and share architectural and engineering expertise.
• Continuously develop technical skills through training, reading, knowledge sharing, and staying informed about emerging technologies.

Profile • Degree in Computer Science, Information Technology, Engineering, or a related field.• 7+ years of backend development experience with Java and Spring ecosystem.
• Proven experience in solution architecture.
• Experience delivering features in agile environments.

Technical Proficiencies:
• Strong knowledge of Java, Spring Boot, Spring Security, and RESTful API development.
• Experience with event-based architecture, Kafka, RabbitMQ, and eventual consistency patterns.
• Proficiency in RDBMS, especially PostgreSQL, and ORM tools.
• Familiarity with CI/CD pipelines, Git workflows, and tools such as Bamboo, Jenkins, GitLab CI.
• Testing mindset: solid experience in unit, integration, and contract testing.
• Experience with containerization tools like Docker; knowledge of Kubernetes is an asset.
• Familiarity with system modeling practices, such as UML, ArchiMate, or equivalent standards to support architectural design and documentation.
• Experience with Atlassian tool stack, especially Jira for backlog management and Confluence for technical and project documentation.
• Exposure to observability tools such as Prometheus, Grafana, is a plus.

Soft Skills:
• Excellent communication and collaboration skills.
• Strategic thinker with strong problem-solving and analytical abilities.
• Able to mentor others and promote a culture of continuous improvement.
• Fluent in English (spoken and written).Organisation and department description Our client is a leading European company specializing in internet infrastructure, located in the Brussels area. Join a dynamic, multicultural team at a tech-driven company with a human-scale approach.

Offer • A dynamic and international work environment.
• A competitive compensation package that includes a competitive salary, a company car, meal vouchers, a comprehensive group and health insurance plan and additional holidays.
• Healthy work-life balance including hybrid work.
• Opportunities for growth and development.
• A role that supports a high-impact, high-visibility European digital initiative.

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*This function is open to everyone. Regardless of gender, sexual orientation, origin, philosophical or religious beliefs, age, or disability.