Mechanical Engineer - LHCb Calorimeter (EP-LCB-2026-163-GRAE)

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CERN is seeking a Mechanical Engineer to help enhance the LHCb electromagnetic calorimeter (ECAL), including production of new ECAL modules and reassembly of the ECAL structure. You will prepare 3D models and drawings, participate in procurement and quality assurance for new modules, contribute to the reassembly with finite element studies, and engage in R&D to improve existing ECAL modules. The ideal candidate has a proven track record in 3D CAD design, hands-on structural simulations, and experience with heavy absorbers (lead, tungsten) or metal additive manufacturing is a plus. CATIA and ANSYS knowledge is advantageous; you must thrive in an international multi-disciplinary team and produce clear technical documentation; English required, willingness to learn French. Eligibility requires CERN Member State nationality, up to two years post graduation with a bachelor or master, no prior CERN fellowship or graduate contract, PhD not eligible. The contract is 24 months with possible extension up to 36, hybrid, Geneva onsite, target start 01 September 2026, with work in radiation areas and medical clearance required before offer. Apply by 02.07.2026 23:59 CEST. Tips: tailor CV to highlight CAD/FEA, QA/procurement, heavy material or additive manufacturing experience, and demonstrate collaboration, documentation skills, and readiness to learn French; prepare for health clearance early.

Job Description

As a mechanical engineer, you will participate in the enhancement of the LHCb electromagnetic calorimeter (ECAL) in the coming years. This includes participation in the produciton of new ECAL modules and the re-assembly of the ECAL structure.

Your responsibilities

• Prepare 3D models and drawings of mechanical parts and assemblies.
• Participate in procurement and quality assurance tasks for new ECAL modules.
• Contribute to the design work in view of the re-assembly of the ECAL, including finite element studies of mechanical structures.
• In addition, participate in R&D towards the improvement of the existing ECAL modules.

Your profile

• Proven track record in designing mechanical parts and assemblies using 3D CAD tools.
• Hands-on experience in structural simulations using finite element analysis.
• Experience with heavy materials used as absorbers in calorimetry (lead, tungsten) is an advantage.
• Experience with additive manufacturing, in particular utilising metals, is an advantage.

Skills

• Knowledge of the CATIA and Ansys Mechanical software packages is an advantage.
• Ability to work in an international multi-disciplinary team with physicists, engineers and technicians.
• Skills to prepare comprehensive technical 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 Mechanical Engineering (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: 02.07.2026 at 23:59 CEST.

Contract duration: 24 months, with a possible extension up to 36 months maximum.

Working hours: 40 hours per week

Job flexibility: Hybrid

Target start date: 01-September-2026

This position involves:

• Work in Radiation Areas.
• Interventions in underground installations.
• A valid driving licence.
• Work during nights, Sundays and official holidays, when required by the needs of the Organization.
• Exposure to lead.
• Exposure to risk of falling from heights during scaffolding assembly and dismantling operations.
• Exposure to electromagnetic fields under certain exposure conditions.

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

Job reference: EP-LCB-2026-163-GRAE

Field of work: Mechanical Engineering

Benchmark job: 200090 - Mechanical Engineer

Global Benefits

• A monthly stipend between 5266-5793 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.

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