Computational Physicist – Beam Simulation Software

What you'll do

The Computational Accelerator Physics section (BE-ABP-CAP) develops and maintains CERN’s software ecosystem for accelerator design and beam-dynamics simulation, providing the tools and models that drive machine performance and future upgrades. In this role you will directly contribute to the development an evolution of these tools. You will collaborate with the maintainers of accelerator model repositories to ensure their consistency and interoperability, and create new computational methods to model physical phenomena relevant to future collider design, such as the FCC-ee. This position offers a unique opportunity to work at the interface of accelerator physics, scientific software development, and large-scale simulation, driving the design of next-generation accelerators at CERN.

Your responsibilities

Participate in the development and evolution of the CERN software stack for accelerator design and beam dynamics simulation;
Develop numerical methods and software solutions for modelling physical phenomena relevant for FCC-ee design;
Build and maintain accelerator models of current and future machines comprising the CERN accelerator complex, to be used in simulation studies and design optimisation;
Collaborate with users and maintainers of accelerator model repositories to ensure consistency, integration, and efficient sharing of resources.

Still here? Let's make a quick check about

Your profile

Experience in Accelerator Physics and software development in a scientific computing context;
Experience in developing computation physics simulation software following good practices is an asset;
Motivation to work at the intersection of novel accelerator designs and simulation tools;
Ability to collaborate in a multidisciplinary and international team environment;
Your studies focused on Applied Physiccs.

Your skills

Knowledge of accelerator modelling and beam dynamics simulation tools (e.g. Xsuite, MAD, SAD, ...);
Programming skills (Python, C) for code development and data analysis;
Familiarity with numerical methods and scientific computing tools;
Problem-solving mindset and ability to learn new tools and concepts quickly;
Spoken and written English, with a commitment to learn French

Ideal start date: 01/03/2026

Contract duration: 24 month contract

Job flexibility: Fully Onsite

Global Benefits at CERN

A monthly stipend between 6287-6911 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.

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.
By the application deadline, you have a master’s degree with 2 to 6 years of professional experience since graduation or a PhD with a maximum of 3 years of professional experience since graduation. You are not eligible with only a bachelor’s degree.
You have never had a CERN fellow or graduate contract before.
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
A copy of your most relevant diploma or a certificate of achievement from your school (if you don't yet have your paper diploma)

Your CERNDepartment

The BE department is at the heart of CERN's accelerator complex.

It is responsible for the design, construction, and operation of accelerators and technical infrastructure that provide the cutting-edge scientific instruments needed by the physics community.

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!

Ready To apply?

Be prepared with our resources and tips

All good?

Apply now Allow 15 minutes to complete your online application

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.
What is the working language at CERN?

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.
Do I need a visa to work at CERN?

Whether you need a visa to work at CERN depends on your nationality and the duration of your stay. CERN assists with the necessary visa and work permit processes for its employees and visitors. The specific requirements will be communicated to you during the recruitment process.
What would my salary be?

Salaries at CERN are determined by a structured scale. Salaries are based on your role, qualifications, and experience, and are not subject to negotiation. Specific details will be provided as your application progresses. For more information, please refer to the dedicated page.