Physics Software Developer

Job Details

What You'll Do
You will consolidate the FCC-PED software activities, with a focus on the area of detector simulation, signal digitization and event reconstruction, in view of enabling (i) FCC-ee detector design optimization during the pre-TDR phase and (ii) submission of detector letters of intent after the FCC approval.

Your Responsibilities

• Drive the support, maintenance, and enhancement of the FCC simulation software ecosystem and reconstruction algorithms, including exploring, validating, and harnessing new technologies that could improve the efficiency of FCC detector simulation and event reconstruction.
• Coordinate contributions to the FCC detector simulation software ecosystem, event reconstruction algorithms, and performance evaluation tools.
• Ensure compatibility/synergy of the required software developments with the evolution of the Key4hep common software ecosystem, which is part and parcel of the FCC software.
• Engage with the worldwide FCC user community, foster collaboration and external contributions to the FCC detector simulation, event reconstruction, and performance evaluation software, and organise relevant support channels.

Your profile

• Experience with detector simulation and event reconstruction is required.
• Familiarity with the programming languages mostly used in High Energy Physics (HEP), primarily Python and C++ is required.
• Competence in using modern HEP software tools, such as ROOT, Geant4 and DD4hep is required.
• Practical knowledge of tools and methods involved in all phases of modern, collaborative, open-source software development, including design, coding, code reviews, and testing for large-scale scientific software systems is required.

Your Skills

• Knowledge of programming techniques and languages: : proficiency in C++ and Python.
• Simulation, design and development of (parts of) detectors.
• Development of application software.
• Re-use, refactoring, integration and porting of existing software.

Global Benefits At CERN

• A minimum entry-salary of 9113 Swiss Francs per month (tax free) increasing in line with your years of relevant experience;
• 30 days of paid leave per year plus 2 weeks 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 grand and travel expenses) depending on your individual circumstances;
• Possibility to extend your contract for up to 8 years + eligibility for indefinite contract tenure;

Be sure to meet the eligibility criteria

• You are a national of a CERN Member State or Associate Member State.
• You have relevant qualifications and professional experience.
• If you have previously held a Staff contract at CERN, you will not be eligible for these positions.
• Please pay attention to the additional criteria and requirements for this specific position and mentioned above.

You will need these documents to complete your application

• Your CV (English or French);
• Any document you consider relevant to your application.

Your CERN Department
The EP department conducts research in experimental particle physics
and serves as a key reference center for the European physics community, contributing to the education and training of young scientists.

Overview Of CERN
Discover a world where the impossible is made possible
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
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Ideal start date
: 01/03/2026

Contract duration
: 60 month contract

Grade range
: 6

Benchmark job
: Applied Physicist

Job flexibility: Hybrid