Senior Java Developer (Spring) - Hybrid | Brussels

SEIDOR; Brussel; Hybrid; EUR 70,000 - 95,000; Full time

Job summary

SEIDOR, a multinational technology company with a start-up spirit, is seeking a Senior Java Developer to join our Brussels team in a hybrid role. You will design, develop and test back-end components within the Spring ecosystem, implement REST and event-driven APIs, and ensure secure authentication and authorization.

You will contribute to persistence layers, messaging integrations, and CI/CD workflows, while participating in code reviews, pair programming, and API documentation.

Qualifications

• 4+ years of experience developing Java back-end applications.
• 8 years of experience with the Spring ecosystem (Spring Boot, Spring Security, Spring Data).
• 8 years of experience designing and implementing REST APIs and event-driven integrations.
• 6 years of experience with relational databases and ORM frameworks (Hibernate/JPA).
• 5 years of experience with development and DevSecOps tooling, including Git, Jira or equivalent, Confluence or equivalent, and CI/CD pipelines (Jenkins, Bamboo or equivalent).
• 3 years of experience as technical lead of a back-end development team, including design decisions and coding standards.

Responsibilities

• Design, develop and unit-test back-end components using the Spring ecosystem.
• Implement REST and event-driven APIs and the underlying business logic.
• Implement persistence layers and integrate with messaging systems.
• Implement authentication and authorisation (OAuth 2.0 / OIDC / SAML).
• Contribute source code and configuration to the customer's CI/CD pipeline.
• Participate in code reviews and pair programming.
• Produce and maintain API documentation.
• Identify, debug and fix defects; support deployment and migration activities.

Skills

Java back-end

Spring ecosystem

REST APIs

OAuth/OIDC/SAML

CI/CD

Technical leadership

Education

Bachelor's degree in Computer Science

Master's degree in Computer Science

Tools

Docker

Kubernetes

Kafka

RabbitMQ

Git

Jira/Confluence

Job description

SEIDOR, a multinational technology company with a start-up spirit, is seeking a Senior Java Developer to join our Brussels team in a hybrid role. You will design, develop and test back-end components within the Spring ecosystem, implement REST and event-driven APIs, and ensure secure authentication and authorization.

You will contribute to persistence layers, messaging integrations, and CI/CD workflows, while participating in code reviews, pair programming, and API documentation.