Backend Software Developer (Java/Python) (BE-CSS-DSP-2026-151-GRAE)

Join CERN as a Software Engineer in the Data Processing Platform! Enjoy a collaborative and innovative work environment with great benefits.

Tasks

• Develop and maintain software for the Data Processing Platform (DPP).
• Collaborate with stakeholders to deliver reliable software solutions.
• Contribute to the evolution of platform architecture and integrations., You will contribute to the design, development, testing and maintenance of the Data Processing Platform (DPP), used for both offline and online analysis of accelerator and beam data. Working within the Data Processing team of the CERN Controls Software & Services group and following the Scrum methodology, you will help build reliable and scalable backend services supporting the control, monitoring and analysis of particle accelerators and equipment.

You will participate in the validation and evolution of the platform architecture, develop production-ready integrations, and contribute to the modernisation of existing services through the migration of legacy systems to the DPP.

Your responsibilities

• Contribute to the design, development, testing, and maintenance of software components for the Data Processing Platform (DPP).
• Collaborate with senior developers and stakeholders to gather requirements and implement reliable software solutions for accelerator controls and data processing.
• Participate in the evolution of the platform by contributing to new features, integrations, and improvements to existing services.
• Contribute to software quality activities, including testing, code reviews, debugging, and documentation.
• Learn and apply modern software engineering practices, tools, and technologies used within the CERN Controls Software & Services group.

• Bachelor's or Master's in Software Engineering or related field.
• Proficient in Java and Python, with a focus on software quality.
• Familiar with cloud-native technologies and modern software practices., * Experience in software development using Java and Python.
• Interest in software quality practices, testing methodologies, and maintainable software design.
• Interest in cloud-native technologies and modern software platforms; familiarity with Kubernetes, Knative, or similar technologies would be considered an asset.

Skills

• Good knowledge of object-oriented programming principles and software engineering fundamentals.
• Understanding of concurrent programming and distributed systems concepts.
• Knowledge of the Spring Framework ecosystem (Spring Boot).
• Familiarity with version control systems, CI/CD concepts, and automated development workflows.
• Exposure to monitoring and logging tools such as Prometheus, Grafana, or the ELK Stack would be considered an advantage.
• 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, Computer Science (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!