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Java Back-End DeveloperSee all recent Jobs

Overview

Experience: Senior

Skills: Java, Spring, Springboot, Kafka, Oracle DB, SSO

Reference Number: UPC1132

Marker Belgium, Brussels Marker

We are seeking a skilled and experienced Java Back-End Developer to join our team on an on-site assignment at the European Commission in Brussels. This is an exciting opportunity to contribute to high-impact, scalable digital solutions at the heart of the EU.

As part of a multidisciplinary team, you will be involved in the full development lifecycle of secure and scalable applications supporting complex business processes. You’ll work in a multicultural, fast-paced environment with a high degree of autonomy and responsibility.


Key Responsibilities

  • Design, develop, and maintain robust and scalable back-end applications
  • Implement core business logic and application functionality
  • Create and manage servers and databases ensuring data integrity and performance
  • Ensure security best practices and data protection compliance
  • Collaborate with front-end developers for cross-platform optimization and integration
  • Develop and document RESTful and SOAP APIs
  • Lead and contribute to the design of scalable software architectures
  • Maintain clean, functional, and well-documented code
  • Perform code analysis, troubleshoot, and identify areas for improvement
  • Conduct unit testing, fix bugs, and ensure overall system reliability
  • Produce and maintain comprehensive technical documentation
  • Participate in project meetings with technical and non-technical stakeholders
  • Take the lead on specific projects or modules, when required

Required Qualifications

  • Bachelor’s degree (EQF Level 6) in Computer Science, Software Engineering, or other IT-related field (minimum 3 years)
  • At least 3–5 years of professional experience in a similar back-end development role

Technical Skills (Required)

  • Java 8+ (professional-level experience)
  • Java Frameworks: Spring, Spring Boot, Hibernate, Java EE
  • API Development: REST, SOAP, OpenID Connect, OAuth2, API Gateway configuration
  • Oracle RDBMS, experience in database performance tuning
  • Messaging systems: Kafka, JMS, ActiveMQ
  • Web servers: Oracle WebLogic, Apache
  • Security protocols: SSL/TLS, reverse proxy configuration
  • Cloud services: Amazon Web Services (AWS), microservices architecture, cloud-native development
  • CI/CD tools: Bamboo, Git
  • Testing tools: SOAPUI, ReadyAPI, Postman
  • Containerization: Docker
  • Basic familiarity with NoSQL databases (e.g. MongoDB) is a plus
  • Understanding of Agile/Scrum methodologies

Soft Skills

  • Strong analytical and problem-solving skills
  • Excellent organizational and time management skills
  • Ability to work autonomously as well as part of an international team
  • Strong attention to detail and code quality
  • Effective communication skills in multicultural and multilingual environments
  • Proven collaboration and mentoring abilities
  • Discretion and integrity when working with sensitive or personal data

Languages

  • English: Minimum B1 level (oral and written) – required
  • French: Minimum B1 level – desirable

Nice to Have

  • Familiarity with Kubernetes or other orchestration tools
  • Experience with front-end frameworks such as Angular, TypeScript, HTML/CSS
  • Previous experience in public sector or EU institutions environments

Why Join Us

  • Work on critical digital services at the heart of European governance
  • Contribute to large-scale systems that serve millions of EU citizens
  • Join a team of professionals working on cutting-edge technology in a secure and structured environment
  • Be part of a multicultural, inclusive workplace with a focus on innovation and sustainability

 

About UpcoMinds
UpcoMinds is a dynamic IT Company with 28 years of experience, offering end-to-end web and mobile solutions that help businesses reinvent themselves in the digital world.
Alongside our strong technical and design expertise, we operate in Cyprus as an IT Outsourcing & Recruitment partner, connecting professionals with top-tier roles on behalf of our clients.
We support large-scale projects in the public sector, semi-governmental organizations, banking and the technology industry, helping our clients build reliable teams and deliver digital innovation.
Through long-term collaborations, we match skilled talent with the right opportunities, contributing to meaningful, real-world transformation.
🌐 Learn more at www.upcominds.com

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