Job Description

Your responsibilities

CERN’s ATLAS experiment is seeking a talented Software Developer to join the Data Processing team. In this role, you will contribute to the development and optimization of the ACTS (A Common Tracking Software) toolkit—an experiment-agnostic track reconstruction software designed for high performance in the HL-LHC era and beyond. The ACTS toolkit is integral to the ATLAS experiment’s strategy for offline and Event Filter track reconstruction for Run 4 and future operations.

Key Responsibilities:

• Develop, optimize, and maintain ACTS-based track finding, fitting, and vertex reconstruction software.
• Focus on adapting and fine-tuning the software for the ATLAS Inner Tracker (ITk) to ensure optimal performance.
• Lead and coordinate efforts to enhance the computational and physics performance of ACTS, supporting the ATLAS HL-LHC physics program.
• Serve as a core member of the ACTS development team, managing parts of the development and deployment processes.
• Provide advisory and supervision support to junior colleagues within ATLAS and collaborating institutions.

Your profile

Skills

• Proven experience with modern C++ programming techniques.
• Understanding of track reconstruction concepts, algorithms, and their efficient implementation in High-Energy Physics (HEP) experiments.
• Proficiency in software development tools and practices within a Linux environment.
• Ability to communicate opinions, ideas, and suggestions convincingly, clearly, and in a logical and structured manner, staying on topic.

Eligibility criteria:

• You are a national of a CERN Member or Associate Member State.
• You have a professional background in Experimental Physics (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: 27.03.2025 at 23: 59 hrs CET.

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

Working hours: 40 hours per week

Target start date: 01-May-2025

This position involves:

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

Job reference: EP-ADP-OS-2025-35-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.