Software Engineer (SY-RF-CS-2026-117-LD)

As a Software Engineer, you will develop Python applications that support the simulation, automation and operation of radiofrequency systems across CERN's accelerators.

You will contribute to the full software lifecycle, from understanding user needs and designing solutions to testing, deployment and operational support.

You will also collaborate with developers working on C++ real-time control software and contribute to tools and interfaces that connect high-level applications with low-level hardware systems.

Functions:

• Design, develop, and maintain Python-based software applications and tools for the configuration, monitoring, automation, commissioning, and analysis of RF systems across CERN's accelerator complex.
• Collaborate with engineers and physicists to understand operational requirements and deliver reliable, user-focused software solutions integrated with real-time control systems and C++ middleware components.
• Develop automation, testing, and deployment workflows using modern software engineering practices, including CI/CD, containerised environments, and maintainable software architectures.
• Participate in the deployment, commissioning, operational support, and continuous improvement of software systems used during accelerator operation, including on-call support activities.
• Contribute to technical documentation, knowledge sharing, and software quality practices within the team and the wider controls software community., * Participation in a regular stand-by duty, including nights, Sundays and official holidays.
• Work in Radiation Areas.
• Work during nights, Sundays and official holidays.
• Interventions in underground installations.
• A valid driving licence.
• Exposure to electromagnetic fields under certain exposure conditions.
• Given the occupational health risks associated with this position, the selected candidate must obtain medical clearance before a contract offer is confirmed.

Master's degree or equivalent relevant experience in the field of computer science, software engineering, applied physics, electronics engineering or a related field., * Solid Python development skills, ideally including scientific libraries (NumPy, SciPy, Matplotlib) and GUI frameworks (PyQt).

• Understanding of C++ sufficient to read and interface with existing control-system code.
• Knowledge of software engineering processes: version control (Git), testing, CI/CD and containerisation.
• Experience delivering production-quality software in scientific or engineering environments.
• Exposure to radiofrequency or accelerator systems is an advantage but not required.

Technical competencies:

• Development of application software.
• Development of software for embedded and real-time systems with/without OS.
• Knowledge and application of software life-cycle tools and procedures.
• Testing, diagnosing and optimisation of software.

Behavioural competencies:

• Achieving results: having a structured and organised approach towards work; being able to set priorities and plan tasks with results in mind.
• Demonstrating flexibility: adapting quickly and resourcefully to shifting priorities and requirements.
• Solving problems: identifying, defining and assessing problems, taking action to address them.
• Communicating effectively: ensuring that information, procedures and decisions are appropriately documented.
• Working in teams: understanding when teamwork is required to achieve the best results; including others accordingly and sharing information.

Language skills:

• Spoken and written English, with a commitment to learn French.

• A competitive salary (tax free), increasing in line with your years of relevant experience.
• 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, removal, travel expenses) depending on your individual circumstances.
• Possibility to extend your contract up to 8 years + eligibility for indefinite contract tenure.

At CERN, the European Organization for Nuclear Research, physicists and engineers are probing the fundamental structure of the universe. Using the world's largest and most complex scientific instruments, they study the basic constituents of matter - fundamental particles that are made to collide together at close to the speed of light. The process gives physicists clues about how particles interact, and provides insights into the fundamental laws of nature., 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!