Junior Mechanical Engineer for CMS Experiment

What you'll do

We are seeking a motivated Mechanical Engineer (ORIGIN) to lead the design, procurement and on-site implementation of a reinforced passage bridge in UXC55, and to support associated heavy lifting operations for the HL (High Luminosity) upgrades. In this role you will act as the technical coordinator for the reinforced bridge that will allow passage of the Endcap Calorimeters structures. You will manage the full lifecycle from concept and detailed design through procurement, manufacturing follow-up and site installation, and you will support the monitoring and execution of heavy lifting activities.

Your responsibilities

Produce concept and detailed mechanical/structural designs enabling safe passage of heavy Calorimeters structures, including load cases, interfaces and integration constraints.
Prepare procurement packages (specifications, drawings), select suppliers, monitor manufacturing progress, and ensure conformity with specifications and schedules.
On-site installation oversight: Supervise installation activities in UXC55, coordinate with CERN teams and external contractors, ensure installation meets drawings, tolerances and safety requirements.
Develop a complete 3D scenario of the full HL sequence for the area (assembly, transport, installation), perform clash detection and sequencing to validate operations and interfaces.
Produce and maintain technical documentation, installation reports and as-built drawings.

Still here? Let's make a quick check about

Your profile

Ability to perform load calculations, structural checks and to produce design justifications for reinforced structures;
Proficiency with 2D/3D CAD (e.g., AutoCAD, SolidWorks, CATIA) and experience with finite-element tools for structural validation;
Ability to create clear manufacturing drawings and as-built documentation;
Demonstrated experience in Mechanical design: CAD drawings (CATIA) and FEA simulation (ANSYS);
Experience preparing technical specifications, following supplier manufacturing, and performing quality checks;
Familiarity with heavy lifting operations, rigging studies, lifting plans and vendor coordination;
Experience coordinating meetings and documenting project progress;
Your studies focused on Mechanical Engineering.

Your skills

Design and analysis tools: CATIA & ANSYS;
Analytical calculation according to applicable standards (Eurocode);
Strong organisational skills, scheduling, supplier management and reporting;
Excellent interpersonal skills for liaising with internal CERN teams, external contractors and specialist vendors;
Skilled in technical reporting and documentation;
Spoken and written English, with a commitment to learn French.

Ideal start date: 01/03/2026

Contract duration: 24 month contract

Job flexibility: Fully Onsite

Employment conditions

A valid driving licence.
Interventions in underground installations.

Global Benefits at CERN

A monthly stipend between 5196-5716 Swiss Francs per month (tax free) depending on your degree.
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 and travel expenses) depending on your individual circumstances.
Possibility to extend your contract up to 36 months.
On-the-job and formal training including language classes.

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.
By the application deadline, you have a maximum of 2 years of professional experience since graduation in the respective field and your highest educational qualification is either a bachelor’s or master’s degree. You must have a university degree and can’t hold a PhD.
You have never had a CERN fellow or graduate contract before.
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
A copy of your most relevant diploma or a certificate of achievement from your school (if you don't yet have your paper diploma)

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!

Ready To apply?

Be prepared with our resources and tips

All good?

Apply now Allow 15 minutes to complete your online application

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.