Mechanical Engineer for the CMS Experiment

What you'll do

Are you a self-driven Mechanical Engineer with strong analytical, design, and integration skills, eager to take part in one of the most complex detector installation projects at CERN?

You will join the CERN Experimental Physics Department (EP) to work in the CMS Experiment Systems Group (CMX) Safety, Coordination and Integration (SCI) section.

Within the CMS Technical Coordination team, you will play a central role in defining the detailed installation methodology of the new CMS High Granularity Calorimeter (HGCAL) during the LHC’s third long shutdown (LS3). This work will involve developing the detailed mechanical procedures, defining specific tooling, and performing precise simulations to anticipate movements and ensure the correct positioning of the calorimeter relative to the CMS endcap structures (YE). You will also play key roles in the removal of the existing endcap calorimeter systems (more than 250 tonnes) from CMS, bringing them to the surface, and storing them in another facility.

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Your responsibilities

Model and simulate mechanical movements, tooling interfaces, and integration constraints to anticipate all installation phases.
Define and document the detailed installation methodology for the CMS HGCAL detector within the CMS endcap (YE) structure.
Design and specify dedicated tooling and handling systems, if necessary.
Define technical specifications and follow up on the procurement of mechanical interface components.
Validate the nominal detector position and define mechanical tolerances and reference systems relative to the YE structure. Interface with the Survey team and define the survey strategy.
Contribute to the follow-up of the heavy lifting contract (company: VSL), including validation of documentation and supervision of manufacturing activities and site operations, in collaboration with the contractor and CERN technical teams.

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Your profile

Demonstrated experience in mechanical design, integration, and installation of large-scale assemblies using CAD software (CATIA).
Proven ability to perform detailed complex mechanical simulations using FEA software (ANSYS).
Project Management: strong organisational skills, scheduling, supplier management and reporting.
Experience in tooling design for handling or positioning heavy and delicate components.
Master's degree or equivalent relevant experience in the field of Mechanical Engineering or a related field.

Your skills

You are experienced in the design and analysis of mechanical structures.
You have experience integrating mechanical systems.
You have knowledge of design codes and can perform compliance verification of mechanical equipment.
You can produce 2D drawings and 3D models; you are proficient in Catia V5 or equivalent 3D modelling software and have a strong understanding of drawing annotations.
You have knowledge of numerical modelling applied to mechanics, and proficiency in ANSYS is a strong asset.
You have a structured and organised approach to your work; you can set priorities and plan tasks with results in mind.
You take initiative beyond regular tasks and make things happen.
You are willing to work on different projects simultaneously.
Spoken and written English, with a commitment to learn French.

Ideal start date: 01/03/2026

Contract duration: 36 month contract

Grade range: 6

Benchmark job: 200090 - Mechanical Engineer

Job flexibility: Fully Onsite

Employment conditions

A valid driving licence.
Work in Radiation Areas.
Interventions in underground installations.

Global Benefits at CERN

A minimum entry-salary of 9113 Swiss Francs per month (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.

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.
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 and serves as a key reference center for the European physics community, contributing to the education and training of young scientists.

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.