Mechanical Technician for the CMS ECAL Detector at LHC

What you'll do

As Mechanical Technician you will contribute to the upgrade project of the electromagnetic calorimeter (ECAL) of the CMS detector at LHC covering a large panel of activities and responsibilities, from mechanical works, handling and assembly of detector parts, logistic activities. You will work in close collaboration with all ECAL collaborators and CMS technical team.

Your responsibilities

Provide mechanical support for all the ECAL activities.
Ensure the safe handling of very fragile ECAL detector Supermodules during extraction, insertion and refurbishment.
Coordinate the logistics of materials and equipment required for ECAL detector refurbishment activities.
Serve as the technical contact person between CMS experiment site and ECAL refurbishment team.
Provide technical support for detector maintenance activities, including cooling systems, mechatronic equipment, and instrumentation set-ups.

Still here? Let's make a quick check about

Your profile

Reading 2D/3D designs, manufacturing mechanical parts accordingly.
Design, construction, assembly of mechanical components.
Detector assembly (including cooling, pressure test, leak detection).
Handling of large and fragile equipment.
Working with multidisciplinary teams.
Experience in producing 2D and 3D drawings.
Experience of cutting, polishing and assembly of optical material.
Experience on cabling and soldering.
Knowledge of applying safety regulations and procedures.
Higher Technical Diploma or equivalent relevant experience in the field of Mechanics, Mechatronic or a related field.
Knowledge of cooling operation and maintenance, experience in logistic coordination.

Your skills

Assembly of mechanical structures and equipment.
Manufacturing of mechanical parts.
Integration of mechanical systems.
Operation and maintenance of cooling water systems.
Operation of handling system.
Delivers prompt and efficient service taking into account customer needs.
Adopts a pragmatic approach; understands the value of adopting generic rather than gold -plated' technical solutions.
Adapts quickly and resourcefully to shifting priorities and requirements.
Works well autonomously; takes on activities and tasks without prompting.
Builds and maintains constructive and effective work relationships.
Spoken and written English, with a commitment to learn French.

Ideal start date: 01/09/2026

Contract duration (in months): 60

Grade range: 3

Benchmark job: 300090 - Mechanical Technician

Job flexibility: Fully Onsite

Medical hazard

Exposure to electromagnetic fields under certain exposure conditions.
Exposure to risk of falling from heights during scaffolding assembly and dismantling operations.
Exposure to lead.

Given the occupational health risks associated with this position, the selected candidate must obtain medical clearance before a contract offer is confirmed.

Employment conditions

A valid driving licence.
Shift work, when required by the needs of the Organization.
Work during nights, Sundays and official holidays, when required by the needs of the Organization.
Work in Radiation Areas.
Interventions in underground installations.

Global Benefits at CERN

A minimum net entry-salary of 5929 Swiss Francs per month, 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.

Let's get you ready

Be sure to meet the eligibility criteria

You are a national of a CERN Member State or Associate Member State. Currently, we cannot consider applications from Pakistani and Lithuanian nationals for positions with a 2026 start date, as the ceiling defined under Article II.5 of the Associate Membership Agreement has been reached.
You have relevant qualifications and professional experience.
If you have previously held a Staff contract at CERN, you will not be eligible for these positions.
Please pay attention to the additional criteria and requirements for this specific position and mentioned above.

You will need these documents to complete your application

Your CV (English or French)
Any document you consider relevant to your application

Your CERNDepartment

The EP department conducts research in experimental particle physics in close collaboration with and supporting the wider scientific community working at CERN. This includes designing and operating experiments, developing and constructing detectors, acquiring and analysing physics data.

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!

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Still have a doubt ? Here are the most frequently asked questions

What should I expect during my first week at CERN?

Your onboarding at CERN includes a comprehensive induction programme, which starts with an official welcome session at the beginning of each month. In addition, you will receive important information both before and after your arrival to ensure a smooth transition into your new role. This process is designed to help you get acquainted with CERN’s environment, your team, and the tools and systems you’ll be using.
How big would the team be?

The size of the team you'll be working with at CERN depends on the specific role and department. Some teams are small and highly specialized, while others are larger and more interdisciplinary. During the interview process, you'll have the opportunity to learn more about the team structure for the position you are applying for.
What is the working language at CERN?

The working languages at CERN are English and French. However, it is not always mandatory to speak both languages to work at CERN. We offer language training to help you acquiring the other language.
What support does CERN provide for relocation?

CERN does not offer direct assistance with relocation. However, depending on your role and specific criteria, you may be eligible for certain benefits such as an installation allowance and coverage of travel expenses to join CERN. These benefits are designed to help ease the transition when relocating to the Geneva area. For more information, please consult the “Salary, Benefits and Support“ page.
Do I need a visa to work at CERN?

Whether you need a visa to work at CERN depends on your nationality and the duration of your stay. CERN assists with the necessary visa and work permit processes for its employees and visitors. The specific requirements will be communicated to you during the recruitment process.
What would my salary be?

Salaries at CERN are determined by a structured scale. Salaries are based on your role, qualifications, and experience, and are not subject to negotiation. Specific details will be provided as your application progresses. For more information, please refer to the dedicated page.