Missions

The CNRS LAPP (Laboratoire d'Annecy de Physique des Particules) institute is looking for an excellent candidate for a software engineer position to work on the ATLAS experiment (https://atlas.cern/) at the Large Hadron Collider (LHC) at CERN. The work is funded through the European Research Council Grant DITTO (2023-2028). The goal of the DITTO project is to search for new phenomena at mass scales beyond the reach of direct production at the LHC through precision measurements of the dilepton production processes.

Application and selection will be carried out starting on 21 May 2023, until the position is filled. The position should start on 1st of October 2023 or shortly after.

Activités

The successful candidate will work on the innovative improvements to the ATLAS electron and tau-lepton reconstruction and identification algorithms in both real-time (trigger) and offline physics analysis environments applying the cutting-edge machine-learning techniques.
This work will be done in the latest implementation of the ATLAS software framework Athena [https://atlassoftwaredocs.web.cern.ch/athena/athena-intro/], based on inter-experiment framework Gaudi Hive. The code will be tested in the data being collected by the ATLAS experiment during Run 3 of the LHC (2022-2025). The performance improvements will need to be implemented in a way to facilitate their application in the High Luminosity LHC ATLAS trigger environment (2029+), which will be based on a hybrid architecture (the exact technology CPU/FPGA, CPU/GPU, etc. to be chosen in mid-2025). These performance improvements are needed to ensure the best possible precision of the dilepton production measurements to be performed by the DITTO project team at LAPP.

The position is based at LAPP, with the possibility to travel to CERN regularly (50 km from LAPP). The position will be initially for a period of two years with a possibility of an extension.

Compétences

• Engineering degree, doctorate (BAC+5 or +) in computer science or particle physics
Expertise:
• Experience with machine learning techniques and tools
• Knowledge of C++/Python
• Experience with software development for high energy or nuclear physics experiments would be appreciated
• Experience programming of heterogeneous devices, GPUs, FPGAs, or HPC machines would be appreciated (possibility of training in these areas)
• Skills in Development, deployment and unit tests
• Skills in Continuous integration and deployment on GitLab
• Working in Linux environment

Know-how
• Ability to work within a multidisciplinary team (engineers and physicists)
• Ability to work in a large international collaboration
• Ability to present technical work in english
• Fluency in English, speaking and writing (B2 minimum).
• Basic knowledge of French could be useful.
• Interest to learn and ability to manage the project

Contexte de travail

LAPP is a laboratory of the Institute of Nuclear Physics and Particle Physics (IN2P3), an institute of the National Center for Scientific Research (CNRS), which coordinates programs in these fields. LAPP is a joint research unit (UMR 5814) of the CNRS and the University of Savoie Mont-Blanc (USMB). More than 150 researchers, teacher-researchers, engineers, technicians, administrators, students and foreign visitors work there. The research carried out at LAPP aims to study the physics of elementary particles and their fundamental interactions, as well as to explore their links with the great structures of the Universe. The work of the LAPP teams aims, among other things, to understand the origin of the mass of particles, to unravel the mystery of dark matter or to determine what happened to the anti-matter present in our universe at the time of the Big Bang. LAPP hosts the MUST mid-range data storage and computing center.

The ATLAS group at LAPP is currently involved in in direct searches for new phenomena, precision measurements in the Higgs-boson and gauge-boson sectors as well as the upgrade of the Liquid Argon calorimeter electronics and the construction of the new pixel detector for HL-LHC.

Contraintes et risques

Some short trips have to be planned in France and abroad

Informations complémentaires

Applicants must:
• Apply on the CNRS Job Portal https://emploi.cnrs.fr/Offres.aspx : submit a cover letter explaining their interest in the position and a detailed curriculum vitae (containing a description of their research experience with a list of publications highlighting their personal contributions).
• Have referrals to send at least 2 letters of recommendation directly to
lapp_administration_rh_secretariat@lapp.in2p3.fr (further information can be obtained from this same email address).