Detector Simulation Physicist

CERN is recruiting a detector-simulation physicist to develop GPU-accelerated Monte Carlo software in the Geant4 team, with a focus on optical-photon transport. The work includes GPU algorithm design, validation against established CPU simulations, performance profiling and optimisation, and integration with experimental software frameworks. The 24-month hybrid appointment is based in Geneva with an ideal start date of 1 January 2027. Applications close on 11 October 2026 at 23:59 Geneva time.

Master's degree with two to six years of post-graduation experience, or a PhD with no more than three years of post-graduation experience, in physics, computer science or a related field. Experience with modern C++, GPU programming, numerical validation, testing, profiling and optimisation is required; CUDA, Python and Monte Carlo particle-transport experience are advantageous. Applicants must meet CERN nationality rules and must not previously have held a CERN fellow or graduate contract.