Physics Software Developer – Detector Simulation and Event Reconstruction

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.

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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.
Supervise and coordinate tasks in domains relevant to the FCC software activities.

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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.
Understanding of modern particle detection techniques and knowledge of relevant emerging detector technologies is required.
Demonstrated experience in detector R&D, commissioning and/or operation is an advantage.
Demonstrated experience in emerging common tools such as the Key4hep ecosystem is an advantage.
Demonstrated experience in experimental particle physics data analysis is as an advantage.
PhD or equivalent relevant experience in the field of Experimental Particle Physics or a related field.

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.
Knowledge and application of software life-cycle tools and procedures: and with state-of-the-art software build and deployment tools.
Having a structured and organised approach towards work; being able to set priorities and plan tasks with results in mind.
Sharing knowledge and expertise freely and willingly with others; coaching others to ensure knowledge transfer; Delivering presentations in a structured and clear way; adjusting style and content to the audience; responding calmly and confidently to questions.
Adapting quickly and resourcefully to shifting priorities and requirements; Working well autonomously; taking on activities and tasks without prompting.
Spoken and written English, with a commitment to learn French.

Ideal start date: 01/03/2026

Contract duration: 60

Grade range: 6

Benchmark job: 200140 - Applied Physicist

Job flexibility: Hybrid

Team supervision

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 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.

Let's get you ready

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 CERNDepartment

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! TAKE PART!

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Still have a doubt ? Here are the most frequently asked questions

What should I expect during my first week at CERN?

Your onboarding at CERN includes a comprehensive induction programme, which starts with an official welcome session at the beginning of each month. In addition, you will receive important information both before and after your arrival to ensure a smooth transition into your new role. This process is designed to help you get acquainted with CERN’s environment, your team, and the tools and systems you’ll be using.
How big would the team be?

The size of the team you'll be working with at CERN depends on the specific role and department. Some teams are small and highly specialized, while others are larger and more interdisciplinary. During the interview process, you'll have the opportunity to learn more about the team structure for the position you are applying for.
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The working languages at CERN are English and French. However, it is not always mandatory to speak both languages to work at CERN. We offer language training to help you acquiring the other language.
What support does CERN provide for relocation?

CERN does not offer direct assistance with relocation. However, depending on your role and specific criteria, you may be eligible for certain benefits such as an installation allowance and coverage of travel expenses to join CERN. These benefits are designed to help ease the transition when relocating to the Geneva area. For more information, please consult the “Salary, Benefits and Support“ page.
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What would my salary be?

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