Junior Mechanical Engineer for CMS Experiment (EP-CMX-SCI-2025-277-GRAE)

Employment Type: Full-time

We are seeking a motivated Mechanical Engineer 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;

Your profile
Experience:

• 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.

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.

Eligibility criteria:

• You are a national of a CERN Member or Associate Member State.
• By the application deadline, you have a maximum of two years of professional experience since graduation in génie mechanique (or a related field) and your highest educational qualification is either a Bachelor's or Master's degree.
• You have never had a CERN fellow or graduate contract before.
• Applicants without University degree are not eligible.
• Applicants with a PhD are not eligible.

Additional Information
Job closing date: 26.01.2026 at 23:59 CET.
Contract duration: 24 months, with a possible extension up to 36 months maximum.

Working hours: 40 hours per week

Job flexibility: Fully Onsite

Target start date: 01-March-2026

This position involves:

• Interventions in underground installations.
• A valid driving licence.

Job reference: EP-CMX-SCI-2025-277-GRAE

Field of work: Mechanical Engineering

Benchmark job: 200090 - Mechanical Engineer

Global Benefits

• 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.

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