Applied Physicist in Track Reconstruction (EP-ADP-OS-2020-91-LD)

  • Geneva, Switzerland
  • Contract

Company Description

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

Job Description


Are you interested in solving one of the most complicated computing problems related to the HL-LHC project? Seize this exciting opportunity to join an international team and contribute to cranking up the performance of the LHC in order to increase the potential for discoveries after 2027. Take part!

In the Experimental Physics Department (EP), ATLAS Data Processing Group (ADP), you will be a leading developer for the ACTS common tracking project and for the ATLAS Phase-2 software upgrade project. You will develop modern reconstruction software and novel algorithmic approaches to tackles the tracking challenges at the High Luminosity (HL) LHC. As part of this project you will investigate technologies to adapt the ATLAS software to exploit future processing technologies.


You will:

  • Design and develop software packages for the ACTS open source track reconstruction suite.
  • Ensure the successful deployment of the completed ACTS software suite in ATLAS for Phase-2.
  • Take responsibility for the ITk upgrade software developments and for the release integration for Phase-2.
  • Carry out R&D on modern reconstruction algorithms optimised for the ATLAS Phase-2 tracking detector upgrade ITk, including the application of Machine Learning and Data Science inspired approaches.
  • Provide development support for the current ATLAS offline track reconstruction and fast simulation used for Run-3.
  • Supervise PhD students and fellows working with you on the Phase-2 tracking software upgrade project.


PhD or equivalent relevant experience in the field of experimental physics or a related field.


  • Extensive experience with track reconstruction in high energy and density environments.
  • Extensive hands-on experience in the development of offline software and in the design and implementation of complex tracking packages.
  • Experience with offline software for HEP experiments in general and track reconstruction in particular.
  • Experience in coordinating small development teams and to define directions for future upgrade software developments.
  • Hands-on experience in managing software release integration.

Technical competencies:

  • Simulation, design and development of physics experiments.
  • Knowledge of programming techniques and languages: c++ and Python (incl. software development workflows: git, JIRA, CI, ART).
  • Physics reconstruction.
  • Programming/software development.

Behavioural competencies:

  • Solving problems.
  • Achieving results.
  • Working in teams.
  • Communicating effectively

Language skills:

Spoken and written English; ability to draw-up technical specifications and/or scientific reports and to make oral presentations in at least one of the two languages.

Additional Information

Eligibility and closing date:

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. We welcome applications from all Member States and Associate Member States.

This vacancy will be filled as soon as possible, and applications should normally reach us no later than 06.08.2020.

Employment Conditions

Contract type: Limited duration contract (5 years). Subject to certain conditions, holders of limited-duration contracts may apply for an indefinite position.

These functions require:

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

Job grade: 6-7

Job reference: EP-ADP-OS-2020-91-LD

Benchmark Job Title: Applied Physicist

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