Job Description

Your responsibilities

The LHCb experiment at the LHC focuses on exploring the minute difference between matter and antimatter and searching for new physics. Its simulation software is continually evolving to meet demands of more accurate and larger-scale Monte Carlo samples, essential for physics analysis and future detector upgrades studies.

A new version of the Gauss simulation framework, based on Gaussino, is replacing the existing system. Gaussino integrates Gaudi, HEP generators, and Geant4. Work is underway to incorporate Machine Learning (ML) and GPU acceleration to enhance computational performance. Gaussino is experiment-independent and provides the basic structure for any experiment simulation while Gauss extends it to meet the LHCb specific needs.

As part of the LHCb Detector Group (LBD) within the Experimental Physics Department (EP), you will contribute to explore new approaches in the LHCb simulation software. You will participate to the development and maintenance of the code to ensure its consistency and reliability for production in a flexible manner, including in a future heterogeneous computing environment.

Key responsibilities :

• Contribute and take responsibility for some of the development of the Gaussino and Gauss frameworks, e.g. multi-threading options for different simulation use cases, integration of ML and/or GPU in the generators or detector modelling
• Explore and implement new techniques within the Gauss framework and their use in a distributed heterogeneous production environment.
• Take responsibility for a new, easy-to-use, and flexible infrastructure for configuring Gauss and Gaussino.
• Contribute to the ongoing support and maintenance of Gauss and Gaussino.

Your profile

Skills

• Knowledge of HEP simulation aspects, i.e. generators, detector geometry, Geant4, etc.
• Experience with HEP experiments code, their software lifecycle and building tools
• Experience with simulation software for HEP experiments
• Knowledge of programming techniques and languages (C++, python)
• Spoken and written both English and French.

Eligibility criteria:

• You are a national of a CERN Member or Associate Member State.
• You have a professional background in Particle Physics / Software Engineering (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.

Additional Information

Job closing date: 27.04.2025 at 23:59 Hrs CEST.

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

Working hours: 40 hours per week

Target start date: 01-July-2025

This position involves:

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

Job reference: EP-LBD-2025-52-GRAP

Field of work: Applied Physics

What we offer

• A monthly stipend ranging between 6287 and 6911 Swiss Francs per month (net of tax).
• Coverage by CERN’s comprehensive health scheme (for yourself, your spouse and children), and membership of the CERN Pension Fund.
• Depending on your individual circumstances: installation grant; family, child and infant allowances; payment of travel expenses at the beginning and end of contract.
• 30 days of paid leave per year.
• On-the-job and formal training at CERN as well as in-house language courses for English and/or French.

About us

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. Find out more on http://home.cern.

We are on a Quest. A Journey into discovery like no other. Bring your expertise to our unique work and develop your knowledge and skills at pace. Join world-class subject matter experts on unique projects, in a Quest for greater knowledge and deeper understanding.

Begin your CERN Quest. Take Part!

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.