System & Network Administrator (HSE-RP-CS-2025-242-GRAE)

Job Description

The Radiation Protection (RP) Group of the Occupational Health and Safety and Environmental Protection (HSE) Unit ensures that personnel on the CERN sites and the public are protected from potentially harmful effects of ionising radiation linked to CERN activities. The duties of CERN's Radiation Protection Group include the assessment of radiation hazards from operating accelerators and experiments, the definition of protective measures as well as the legally required monitoring of the exposure of radiation workers and public to ionising radiation.

You would join the HSE-RP-CS (Characterisation & Services) section to play a key role in administering, supporting, and advancing the RP group's high-performance computing infrastructure powering the FLUKA Monte Carlo simulations and the virtualised IT systems supporting our state-of-the-art radio-analytical laboratory.

Your responsibilities

• Review the existing Condor based software stack and investigate possibilities to accommodate the next generation of the FLUKA code (V5).
• Communicate regularly with end-users and provide technical support related to the cluster system.
• Participate in further virtualisation and upgrade of the laboratory's server/client IT infrastructure.
• Investigate and prototype a software stack that allows for parallel deployment of new in-house developed machine learning simulation tools on a Condor cluster.

Your profile

• Knowledge in web application development;
• Basic experience with relational databases;
• Familiarity of OpenStack would be a plus.

Skills:

• Linux server/client and network administration;
• Strong Python, Unix Shell scripting knowledge;
• Knowledge of HPC Condor would be a plus but is not mandatory;
• Web development technologies (HTML, CSS, PHP, Javascript), knowledge in frameworks like React, Django would be a plus;
• Git;
• Basic SQL.
• Spoken and written English or French, with a commitment to learn the basics of the other language.

Eligibility criteria:

• You are a national of a CERN Member or Associate Member State.
• By the application deadline, you have a maximum of two years of professional experience since graduation in Computer Engineering (or a related field) and your highest educational qualification is either a Bachelor's or Master's degree.
• You have never had a CERN fellow or graduate contract before.
• Applicants without University degree are not eligible.
• Applicants with a PhD are not eligible.

Additional Information

Job closing date: at 23:59 CET.

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-March-2026

Job reference: HSE-RP-CS GRAE

Field of work: Software Engineering and IT

Benchmark job: Computing Engineer

What we offer

• A monthly stipend ranging between 5196 and 5716 Swiss Francs (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

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.