Company Description

Job Description

Are you excited about giving a second life to a vintage but invaluable set of data, which has the potential to significantly enhance the quality of the preparation studies for the next flagship collider at CERN, the Future Circular Collider?

The LEP data@EDM4HEP project aims at migrating the data collected and LEP in the 1990s, and the corresponding Monte Carlo simulated events, to a new common format developed for the next generation of HEP experiments. This would enable the use of the tools under development for the electron-positron collision phase of FCC, to be tested on real data.

At the same time, the FAIRness of the data sample would be enhanced by improving on Accessibility and Interoperability, mitigating the risk of losing access to the data.

We are looking for a motivated particle physicist with software skills to continue the feasibility work prototyped so far using the ALEPH data. You will work as a member of the CERN EP-FCC group, in close contact with the Key4HEP team of the CERN EP-SFT group, the members of the DPHEP collaboration, and international teams at Brown University and MIT.

Your responsibilities:

  • Consolidate the extraction chain of the ALEPH data into EDM4hep. This includes ensuring the right data structures are used, possibly proposing/implementing modifications, and optimising the involved applications for performance and easy-of-use.
  • Validate the above with a significant set of benchmark analysis, and apply the validated chain to the whole ALEPH data sample, including Monte Carlo simulated data, complemented with adequate documentation and help tools.
  • Consolidate wokflows to produce new Monte Carlo events with the legacy ALEPH software, still available through containers and/or VMS, in particular in what concernes the use of recent event generators.
  • Investigate ways to apply the same to DELPHI - and possibly OPAL - data. This will require contacts with the relevant DELPHI and OPAL people.
  • Support users of the migrated data in their attempts using their feedback to improve the provided data set and tools.
  • Present the result to relevant events.
  • If needed, supervise students on specific tasks relevant for the project.

Your profile:

The ideal candidate is a particle physicist having in particular:

  • Familiarity with HEP data sets and HEP event data models and their use in analysis.
  • Familiarity in building data analysis libraries with C++, FORTRAN and Python.
  • Familiarity working on large codebase open source projects.
  • Familiarity with tools used in HEP analysis or data storage, such ROOT, and the Key4hep ecosystem.

Skills:

  • Proficient in Python, C++, Git, CMake.
  • Familiar with FORTRAN 77.
  • Flexible to learn new tools and techniques to a level adequate to the project needs.

Optional, but considered a plus:

  • Familiarity with Key4hep.
  • Spoken and written English, with a commitment to learn French.

Eligibility criteria:

  • You are a national of a CERN Member or Associate Member State.
  • You have a professional background in Computer Science, Physics, or similar (or a related field) and have either:
    • a Master's degree with 2 to 6 years of post-graduation professional experience;
    • or a PhD with no more than 3 years of post-graduation professional experience.
  • You have never had a CERN fellow or graduate contract before.

Qualifications

Additional Information

Job closing date: 20.03.2026 at 23:59 CET.

Contract duration: 24 months, with a possible extension up to 36 months maximum.

Working hours: 40 hours per week

Job flexibility: Fully Onsite

Target start date: 01-April-2026

This position involves:

  • Work during nights, Sundays and official holidays, when required by the needs of the Organization.

Job reference: EP-FCC-2026-37-GRAP

Field of work: Applied Physics

Benchmark job: 200140 - Applied Physicist

Global Benefits

  • A monthly stipend between 6372-7004 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.

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!

More information about us, here: careers.cern

At Impactpool we do our best to provide you the most accurate info, but closing dates may be wrong on our site. Please check on the recruiting organization's page for the exact info. Candidates are responsible for complying with deadlines and are encouraged to submit applications well ahead.
Before applying, please make sure that you have read the requirements for the position and that you qualify. Applications from non-qualifying applicants will most likely be discarded by the recruiting manager.