Detector Simulation Physicist (EP-SFT-2026-152-GRAP)

Physics World; Genf; Hybrid; CHF 71.000 - 78.000; Vollzeit

Benefits dieser Stelle

Health insurance

Pension scheme

Relocation package

Training and language classes

Zusammenfassung

CERN seeks a scientist/software engineer to advance GPU-accelerated Monte Carlo detector simulation, focusing on optical photon transport within the Geant4 framework. You will validate physics against CPU simulations, optimize performance, and integrate into experimental software environments.

You will collaborate with international teams, develop tests, and contribute to long-term software quality and documentation, with a hybrid work setup and 40h/week.

Qualifikationen

• Experience developing scientific or physics-simulation software with C++.
• Experience with GPU programming or heterogeneous computing.
• Experience with software testing, validation, and profiling.
• Knowledge of Monte Carlo methods or optical photon transport.
• Experience in collaborative, international software projects is a plus.

Aufgaben

• Design, develop, and integrate GPU algorithms for optical photon simulation.
• Compare GPU results with established CPU implementations.
• Develop unit, regression, and physics-validation tests.
• Profile applications and optimise performance.
• Collaborate with LHC software teams to integrate GPU transport into simulations.
• Engage with Geant4 community on optical photon simulation.
• Contribute to documentation and long-term software quality.

Kenntnisse

Modern C++

CUDA

Python

GPU programming

Performance profiling

Git

Unit testing

Monte Carlo

Geant4

English

Ausbildung

Master's degree (2–6 years exp)

PhD (<=3 years exp)

Tools

Geant4

Nsight Systems

Nsight Compute

Compute Sanitiser

gdb

Perf

Jobbeschreibung

Job Description

In this role, you will develop and improve GPU-accelerated Monte Carlo detector simulation software within the Geant4 team, with a particular focus on optical photon transport. You will contribute to software design and implementation, physics validation against established CPU simulations, performance optimisation, and integration into experimental software frameworks.

Job Details

In this role, you will develop and improve GPU-accelerated Monte Carlo detector simulation software within the Geant4 team, with a particular focus on optical photon transport. You will contribute to software design and implementation, physics validation against established CPU simulations, performance optimisation, and integration into experimental software frameworks.

Your Responsibilities

• Design, develop, and integrate GPU algorithms for optical photon simulation within a Monte Carlo particle-transport framework.
• Compare and validate GPU simulation results against established CPU implementations.
• Develop unit, regression, and physics-validation tests.
• Profile applications, identify performance bottlenecks, and optimise computational performance.
• Collaborate with software teams from the Large Hadron Collider experiments to integrate GPU-enabled particle transport into their simulation frameworks.
• Engage with the international Geant4 collaboration and its user community, particularly in the area of optical photon simulation.
• Contribute to the documentation, maintenance, and long-term quality of the developed software.

Your profile

• Experience in developing scientific or physics-simulation software, preferably using modern C++.
• Experience with GPU programming or software development for heterogeneous computing architectures.
• Experience with software testing, numerical validation, performance profiling, or optimisation.
• Knowledge of Monte Carlo methods or experience with particle-transport simulation would be an advantage, particularly in the area of optical photon transport.
• Experience contributing to collaborative software projects or working within an international scientific environment would be an advantage.

Skills

• Programming languages and technologies: modern C++, CUDA, Python.
• GPU programming, heterogeneous computing, and performance optimisation.
• Git and collaborative software development.
• Unit testing, regression testing, and numerical validation.
• Experience with Monte Carlo particle-transport codes such as Geant4 would be considered an advantage.
• Debugging and profiling tools such as gdb, Compute Sanitiser, perf, Nsight Systems, or Nsight Compute would be considered an advantage.
• 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 Physics, Computer Science, or a related (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: 11.10.2026 at 23:59 CEST.

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

Working hours: 40 hours per week

Job flexibility: Hybrid

Target start date: 01-January-2027

Job reference: EP-SFT-2026-152-GRAP

Field of work: Applied Physics

Benchmark job: 200140 - Applied Physicist

This Position Involves

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

Global Benefits

• A monthly net stipend of either 6372 or 7004 Swiss Francs per month 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.

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