Jobs at CERN

Develop and maintain embedded control applications for CERN’s LHC Collimator Control System using FESA, C++, and Python. Support commissioning, functional and system-level testing, validation of interlocks and fail-safes, alarm-server integration, monitoring tools, expert interfaces, diagnostics, and operational troubleshooting. The role requires collaboration across multidisciplinary engineering teams in a fully onsite environment.

Develop, integrate, and test FPGA gateware and embedded SoC firmware for high-speed beam-position monitoring systems. Implement data acquisition, real-time digital signal processing, and embedded processing algorithms. Validate systems in laboratory and accelerator environments, perform Python-based data analysis, support measurement campaigns, and collaborate with engineers, physicists, and technicians at CERN.

Design, operate, troubleshoot, and optimize CERN’s large-scale distributed storage services across multiple data centers. Work with Ceph-based block, object, and filesystem solutions, including CephFS and NFS integrations. Diagnose Linux, hardware, network, and software issues; develop C++ improvements for Ceph; and contribute to automation, observability, documentation, incident response, change management, and user support.

Provides second-line support for business applications, assists users, coordinates hardware interventions and asset inventory, maintains technical documentation, and supports IT security and process automation. The role involves collaborating with application experts, service providers, and service desk teams to resolve incidents and improve service delivery. Candidates need a relevant bachelor’s or master’s degree, no more than two years of professional experience since graduation, and eligibility as a CERN Member or Associate Member State national.

Manage the childcare facility’s employee administration, including recruitment paperwork, contracts, payroll coordination, social insurance, pensions, leave, and departures under Swiss employment law. Monitor budgets, process invoices and payments, maintain accounting records, support financial reporting, liaise with fiduciaries and authorities, prepare communications, improve processes, and provide occasional reception and enquiry support.

Install, test, operate, and monitor high-availability network infrastructure supporting the ATLAS DAQ system. Deploy network monitoring and alerting, collaborate on scalable solutions, maintain the TDAQ laboratory, and support server and hardware infrastructure. The role includes underground and radiation-area work, standby duty, and occasional nights, Sundays, and holidays. Candidates need basic systems or network administration experience, Linux and networking knowledge, and basic Python and Bash skills.

Provides administrative support to CERN guest scientists, managing registration, personnel formalities, records, documentation, and Host State processes. Supports service continuity, HCM process improvement, user feedback collection, onboarding resources, communication materials, and knowledge sharing. The role requires accurate recordkeeping, strong organization, professional stakeholder interaction in an international environment, Microsoft Office proficiency, and English communication with willingness to learn French.

Develop software for FPGA-based CMS Trigger and Timing Control and Distribution systems at CERN. Responsibilities include configuring, controlling, and monitoring hardware, supporting data acquisition test systems, maintaining repositories and CI/CD infrastructure, conducting system tests, commissioning Phase-2 DAQ systems, and supporting CMS sub-detector teams. The role requires Python and modern C++, web interfaces, hardware interaction, collaborative development, documentation, and occasional work during nights, Sundays, and holidays.

Conduct independent and collaborative theoretical physics research at CERN, developing theoretical models, performing analytical and computational studies, interpreting experimental results, and advancing particle physics. The fellow will pursue an original research program, collaborate with international theoretical and experimental physicists, participate in seminars and workshops, and communicate research findings within CERN’s scientific community.

Develop GPU-accelerated Monte Carlo detector simulation software focused on optical photon transport. Responsibilities include GPU algorithm design, C++ implementation, CPU/GPU physics validation, testing, profiling, optimization, and integration with Large Hadron Collider experiment frameworks. The role also involves collaboration with the Geant4 community, software documentation, maintenance, and quality assurance in an international scientific environment.

Coordinates and supervises heavy transport, handling, lifting, and logistics operations across CERN’s surface and underground facilities. Develops technical specifications, procedures, safety requirements, and contract documentation; assesses transport solutions; supervises contractors; supports dangerous-goods compliance under ADR principles; collaborates on custom handling tools and radiological work planning; and performs specialized handling operations in conventional and radioactive environments.

Designs, documents, tests, commissions, and maintains low-voltage electrical systems for magnet safety, control, and auxiliary infrastructure supporting CERN’s LHC experiments. The role develops electrical circuits, produces technical documentation, troubleshoots systems, and collaborates with engineers, technicians, and physicists. Duties include standby coverage, work in radiation areas and underground installations, and support for future LHC upgrades.

Supports large-scale compute infrastructure at CERN, including lifecycle management of 400,000+ cores, automated provisioning, configuration management, monitoring, and self-healing systems. The role maintains Foreman, Puppet, OpenVox, Terraform/OpenTofu, batch, HPC, and supporting infrastructure. Responsibilities include deploying configuration changes, improving configuration code through testing and review, and contributing to open-source automation for Linux-based data center systems.

Supports safety coordination for the CMS Experiment at CERN, including risk assessments, hazard identification, fire safety compliance, incident analysis, safety documentation, and emergency preparedness. The role contributes to CMS Phase II upgrade safety activities, coordinates evacuations, follows up on safety actions, and collaborates with multidisciplinary technical teams. Work is fully onsite and includes radiation areas, underground installations, occasional off-hours work, and occupational health requirements.

Leads governance, risk, and compliance activities across CERN’s Office of the CIO. Establishes enterprise frameworks for data governance, architecture, cybersecurity, ICT risk, compliance, audit, and vendor governance. Advises senior management and governance bodies, aligns departments and technical stakeholders in a federated environment, and coordinates with cybersecurity specialists. Requires strategic leadership, enterprise risk expertise, ICT architecture knowledge, and strong cross-organization collaboration.

Develop 3D CAD models and detailed 2D manufacturing and assembly drawings for superconducting magnets, prototypes, and tooling. Update designs based on construction and assembly feedback, support procurement, and maintain as-built configurations. Contribute to discussions on tolerances, machining, assembly procedures, and mechanical measurement. Create tailored models for CNC machining and electromagnetic or mechanical simulations while collaborating with engineers and technical specialists.

Conduct postdoctoral research in accelerator physics and system design within CERN’s Accelerator Systems departments. Responsibilities include designing and optimizing beam transfer systems, performing beam optics and particle-tracking studies, developing functional specifications, implementing automated commissioning strategies, and analyzing beam and system performance. The role requires collaboration in an international multidisciplinary research environment and contributes to CERN’s accelerator programs.

Modernize CERN’s geodetic metrology data management system by migrating Oracle APEX and PL/SQL applications to Java/Spring Boot and Angular. Responsibilities include analyzing legacy workflows, designing scalable APIs and software architecture, developing frontend and backend services, writing automated tests, applying quality practices, participating across the SDLC, collaborating with end users and multidisciplinary teams, and supervising team activities.

Develop and improve high-energy physics calibration algorithms for the CMS High-Level Trigger. Maintain and test the Next-Generation Trigger demonstrator, help design a production-grade data acquisition and calibration system for HL-LHC, integrate it with CMS infrastructure, evaluate physics performance, and supervise team members. The role requires Python and C++ development, database knowledge, TDAQ experience, integrated software frameworks, Git, and continuous integration practices.

Maintain and extend CERN’s Security Operations Centre infrastructure for incident detection and response. Secure and configure AWS, Oracle Cloud, Azure, Google Cloud, Microsoft 365, and Google Workspace environments. Perform security analysis, penetration testing, cloud security reviews, and computer security consulting. The role may also involve threat monitoring, incident response, stand-by duty, and occasional work during nights or holidays.