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Medior/Senior Java Developer

SII Group Belgium · Amsterdam

Amsterdam · On-siteFull-TimePosted Jul 8, 2026

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Job description

We are a growing company that contracts engineers to customers and also carries out in-house project work packages. For several of our software development projects, we are looking for experienced and motivated Medior/Senior Java Developers .

Your Role As a Medior/Senior Java Developer , you will be a key contributor to the full software development lifecycle—from initial design and architecture to implementation and delivery. You will work on large-scale, mission-critical applications where reliability and performance are paramount.

You will leverage modern Java frameworks to build robust solutions for our diverse portfolio of international clients.

In this role, you will collaborate closely with domain experts and multidisciplinary teams to deliver high-quality, reliable systems that meet demanding performance requirements

What You Will Be Doing

  • Designing, developing, integrating, and testing new software functionalities using Java 17
  • Translating complex system requirements into efficient, maintainable software architectures
  • Collaborating with domain experts and system architects to deliver robust, scalable solutions
  • Contributing to continuous improvement of development processes, tools, and code quality
  • Working within an Agile environment using tools such as Git, Maven, and Nexus
  • Participating in code reviews, testing activities, and software validation
  • Supporting integration and deployment within embedded or communication system environments

What You Bring

  • Bachelor’s or Master’s degree in Computer Science, Software Engineering, or a related field
  • Solid experience with Java
  • Proven experience developing complex, high-reliability systems
  • Ability to design reliable data exchange systems
  • Experience with Agile development methods and version control tools (Git, Maven/Nexus)
  • Strong analytical and problem-solving skills, with a proactive and collaborative mindset
  • Excellent communication skills and a team-oriented attitude
  • Fluency in English is required; Dutch is a strong plus

What We Offer

  • A challenging position within a high-tech, international, and innovative environment
  • Collaboration with a skilled and passionate team of software specialists
  • Opportunities for personal and professional development, both technical and managerial
  • The chance to contribute to leading-edge projects with major clients and partners
  • A modern and flexible workplace that promotes a healthy work-life balance

Please notice:

  • We don’t offer VISA sponsorships
  • CV’s of recruitment agencies are not accepted
  • not accepted

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