Applied Physicist

Job Posting Organization:
CERN, the European Organisation for Nuclear Research, is a leading scientific research organization established to probe the fundamental structure of the universe. Founded in 1954, CERN employs thousands of physicists and engineers who work collaboratively to study the basic constituents of matter using the world's largest and most complex scientific instruments. The organization operates in multiple countries and is known for its groundbreaking research in particle physics, contributing significantly to our understanding of the fundamental laws of nature.

Job Overview:
The position of Applied Physicist at CERN focuses on consolidating the FCC-PED software activities, particularly in the areas of detector simulation, signal digitization, and event reconstruction. The successful candidate will play a crucial role in enabling the optimization of FCC-ee detector design during the pre-TDR phase and will be involved in the submission of detector letters of intent following FCC approval. This role requires a deep understanding of experimental particle physics and the ability to drive the support, maintenance, and enhancement of the FCC simulation software ecosystem. The candidate will also coordinate contributions to the software ecosystem and engage with the worldwide FCC user community to foster collaboration and external contributions.

Duties and Responsibilities:
The Applied Physicist will be responsible for driving the support and enhancement of the FCC simulation software ecosystem and reconstruction algorithms. Key duties include exploring and validating new technologies to improve the efficiency of detector simulation and event reconstruction, ensuring compatibility with the Key4hep common software ecosystem, and supervising tasks relevant to FCC software activities. The role also involves coordinating contributions to the software ecosystem, engaging with the FCC user community, and organizing support channels for collaboration. The candidate will need to maintain a structured approach to work, set priorities, and plan tasks effectively to achieve results.

Required Qualifications:
Candidates must possess a PhD or equivalent relevant experience in Experimental Particle Physics or a related field. Mandatory qualifications include experience with detector simulation and event reconstruction, familiarity with programming languages used in High Energy Physics (primarily Python and C++), and competence in modern HEP software tools such as ROOT, Geant4, and DD4hep. Practical knowledge of collaborative, open-source software development processes is essential, along with an understanding of modern particle detection techniques and emerging detector technologies. Demonstrated experience in detector R&D, commissioning, or operation will be considered advantageous.

Educational Background:
A PhD in Experimental Particle Physics or a closely related field is required for this position. Candidates with equivalent relevant experience may also be considered. The educational background should include substantial exposure to high-energy physics and software development in scientific contexts.

Experience:
The position requires some level of experience in detector simulation and event reconstruction. Candidates should have practical experience with programming languages, particularly C++ and Python, and familiarity with modern HEP software tools. Experience in collaborative software development and knowledge of particle detection techniques are also essential. Demonstrated experience in detector R&D or experimental particle physics data analysis will be viewed favorably.

Languages:
Fluency in spoken and written English is mandatory, and candidates should be committed to learning French. Proficiency in French will be considered an asset, enhancing communication within the organization and with the wider community.

Additional Notes:
This position is offered as a limited duration contract for 5 years, with the possibility of applying for an indefinite position under certain conditions. The working hours are set at 40 hours per week, with hybrid job flexibility. The role may require work during nights, Sundays, and official holidays based on the organization's needs. The job grade is classified as 6-7, and the reference for this position is EP-FCC-2025-242-LD.