Mechanical Engineer for the ATLAS Detector (EP-ATL-PO-2026-112-LD)

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. 

Introduction

During Long Shutdown 3 (LS3, 2026-2030), the ATLAS detector will be upgraded with new detector systems, requiring detailed engineering work to finalise their design, integration, installation sequence, and connection to services. This will involve substantial on-site activities. As a mechanical engineer, you will join the TC engineering team and serve as the interface between ATLAS Technical Coordination (TC) and the detector upgrade teams, particularly for critical mechanical integration activities.

Functions

• Oversee the design of all mechanical aspects of a detector system, in collaboration with the worldwide institutes contributing to the production of deliverables.
• Define and manage the mechanical interfaces between the ATLAS detector and its infrastructure, including supports and services. Supervise the production of 3D integration models and ensure that the relevant envelopes are properly taken into account.
• Develop the transport and underground installation sequence, and design the associated installation tooling and its interfaces with the detectors.
• Support the detector team in coordinating the production of mechanical components to help ensure their timely delivery and facilitate smooth assembly planning.
• Participate in the assembly of the detectors inside the clean room.
• Supervise the installation of service infrastructure, including cable trays and flexible chains, in the ATLAS detector environment and ensuring it is implemented in line with the detector commissioning needs.
• Supervise the installation of the detectors inside the Experimental Cavern.

Master's degree or PhD or equivalent relevant experience in the field of Mechanical Engineering or a related field.

Experience:

• Solid experience in mechanical design, from 3D modelling to manufacturing drawings.
• Proven expertise in installation of high-technology equipment, requiring accurate procedures and tooling.
• Proven practice in mechanical calculations and Finite Element Analysis.
• Demonstrated experience in writing installation procedures.
• Experience in project management, including planning, procurement, and reporting to project management hierarchy.
• Experience in coordination of designers and technicians.
• Experience in performing a variety of engineering tasks, managing multiple projects in parallel, and working effectively within international and multidisciplinary teams would be an advantage.
   

Technical competencies:

• Integration of mechanical systems.
• Knowledge of design codes and compliance verification of mechanical equipment.
• Assembly and integration of infrastructure for detectors or experimental facilities.
• Knowledge and application of numerical modelling in solid mechanics.
• Assembly of mechanical structures and equipment.

Behavioural competencies:

• Achieving Results: delivering high quality work on time and fulfilling expectations.
• Demonstrating Flexibility: being willing to work on different projects simultaneously.
• Solving Problems: identifying, defining and assessing problems, taking action to address them.
• Working in Teams: gaining trust and collaboration from others.
• Managing Self: taking initiative beyond regular tasks and making things happen.

Language skills:

Spoken and written English, with a commitment to learn French.

Eligibility and closing date:

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. We welcome applications from all Member States and Associate Member States.

This vacancy will be filled as soon as possible, and applications should normally reach us no later than 16.06.2026 at 23:59 CEST.

Employment Conditions

Contract type: Limited duration contract (4 years). Subject to certain conditions, holders of limited-duration contracts may apply for an indefinite position.

Working Hours: 40 hours per week

Job Flexibility: Fully Onsite

This position involves:

• Work in Radiation Areas.
• Interventions in underground installations.
• Work during nights, Sundays and official holidays, when required by the needs of the Organization.
• Exposure to risk of falling from heights during scaffolding assembly and dismantling operations.
• Given the occupational health risks associated with this position, the selected candidate must obtain medical clearance before a contract offer is confirmed.

Job grade: 6-7

Job reference: EP-ATL-PO-2026-112-LD

Field of work: Mechanical Engineering

Benchmark Job Title: Mechanical Engineer

Global Benefits

• A competitive salary (tax free), increasing in line with your years of relevant experience.
• 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, removal, travel expenses) depending on your individual circumstances.
• Possibility to extend your contract up to 8 years + eligibility for indefinite contract tenure.

Overview of CERN - Discover a world where the impossible is made possible!

At CERN, the European Organization for Nuclear Research, we are pushing the frontiers of science and technology. Our groundbreaking work brings together not only physicists but also a diverse range of professionals from engineering, technical, scientific, and administrative fields. Together, we foster an environment where innovation and collaboration thrive.

Every day, we face exciting new challenges and opportunities to contribute to cutting-edge research that shapes our understanding of the universe. We meet these challenges through the diverse perspectives within our teams, ensuring every contribution is valued and driving our shared sense of inclusion and purpose. Diversity is a core value of CERN since its foundation, and it remains central to our mission and continued success.

If you are ready to be part of a dynamic, inclusive community pushing the boundaries of knowledge, CERN is the place where your curiosity and skills can thrive. Be part of our mission to uncover what lies at the heart of the universe! TAKE PART!

More information about us, here: careers.cern