Software Engineer; SY-RF-CS--LD

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

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.

As a Software Engineer, you will develop Python applications that support the simulation, automation and operation of radio frequency 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.

• 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.

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 (Num Py, Sci Py, 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 radio frequency or accelerator systems is an advantage but not required.
• 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.
• 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.
• Spoken and written English, with a commitment to learn French.

Diversity has been an integral part of CERN’s mission since its foundation and is an established value of the Organization. Employing a diverse workforce is central to our success. We welcome applications from all Member States and Associate Member States. This vacancy will be filled as soon as possible, and applications should normally reach us no later than 30.06.2026 at 23:59 CEST.

Contract type:
Limited duration contract (5 years). Subject to certain conditions, holders of limited‑duration contracts may apply for an indefinite position.

Working hours:

40 hours per week.

Job flexibility:
Hybrid.