Java Engineer - Accelerator Controls (BE-CSS-DSP-2026-137-GRAE)

Join CERN's Beams department to innovate in software for accelerators. Contribute to a collaborative and dynamic work environment.

Tasks

• Develop and validate software for the CERN accelerator control system.
• Collaborate with users to support daily operations and resolve issues.
• Work alongside skilled engineers on complex software projects., Within the Beams department, Controls Software and Services group, you will contribute to the evolution and consolidation of the operational tools used to control the accelerator complex. Working alongside a passionate team, you will help design and develop reliable backend solutions aligned with users' needs, supporting the operation of the world's largest particle physics laboratory., * Contribute to the development, testing, and validation of software components of the CERN accelerator control system.
• Collaborate with stakeholders and users to understand requirements and support daily accelerator operations.
• Participate in the investigation, diagnosis, and resolution of operational problems in collaboration with physicists and accelerator operators.
• Collaborate with highly skilled software engineers both inside the BE-CSS group and across the CERN Accelerators & Technology sector.

• Initial software development experience with Java/Spring required.
• Strong knowledge of concurrency, multithreading, and databases.
• Fluent in English, with a willingness to learn French., * Initial experience in software development using Java/Spring.
• Experience writing clean, maintainable code and applying the related principles.
• Ability and motivation to learn and navigate large, complex codebases.
• Positive attitude and experience working in teams (academic or professional).

Skills

• Advanced knowledge of Java/Spring (Python is a plus).
• Concurrency and multithreading.
• Relational databases.
• Linux and container technology (Kubernetes is a plus).
• Testing, diagnosing and optimisation of software.
• Monitoring and troubleshooting of operational software systems.
• Spoken and written English, with a commitment to learn French.

Eligibility criteria:

• You are a national of a CERN Member or Associate Member State .
• By the application deadline, you have a maximum of two years of professional experience since graduation in Software Engineer (or a related field) and your highest educational qualification is either a Bachelor's or Master's degree.
• You have never had a CERN fellow or graduate contract before.
• Applicants without University degree are not eligible.
• Applicants with a PhD are not eligible.

• A monthly stipend between 5266-5793 Swiss Francs per month (tax free) depending on your degree.
• 30 days of paid leave per year plus 2 weeks annual closure.
• Coverage by CERN's comprehensive health insurance scheme (for yourself, your spouse and children), and membership of the CERN Pension Fund.
• Family, child and infant monthly allowances depending on your individual circumstances.
• A relocation package (installation grant and travel expenses) depending on your individual circumstances.
• Possibility to extend your contract up to 36 months.
• On-the-job and formal training including language classes.

At CERN, the European Organization for Nuclear Research, we are pushing the frontiers of science and technology. Our groundbreaking work brings together not only physicists but also a diverse range of professionals from engineering, technical, scientific, and administrative fields. Together, we foster an environment where innovation and collaboration thrive. Every day, we face exciting new challenges and opportunities to contribute to cutting-edge research that shapes our understanding of the universe. We meet these challenges through the diverse perspectives within our teams, ensuring every contribution is valued and driving our shared sense of inclusion and purpose. Diversity is a core value of CERN since its foundation, and it remains central to our mission and continued success. If you are ready to be part of a dynamic, inclusive community pushing the boundaries of knowledge, CERN is the place where your curiosity and skills can thrive. Be part of our mission to uncover what lies at the heart of the universe! TAKE PART!