Mechanical Technician for CMS Detector Upgrades (EP-CMS-IC-2026-97-LD)

At CERN, the European Organization for Nuclear Research, physicists and engineers are probing the fundamental structure of the universe. Using the world's largest and most complex scientific instruments, they study the basic constituents of matter - fundamental particles that are made to collide together at close to the speed of light. The process gives physicists clues about how particles interact, and provides insights into the fundamental laws of nature.

Introduction:

As a mechanical technician, you will contribute to upgrade projects of the CMS detector, covering a broad range of responsibilities. These include workshop-based mechanical work, installation of detector systems, and the design and use of tooling for the removal and installation of CMS sub-detectors, as well as radioprotection duties in experimental areas and associated laboratories.

You will also take on coordination and operational responsibilities within the CMS Technical Coordination team, working closely with sub-detector groups and CMS technical support teams.

Functions:

• Take responsibility for activities related to safety and radioprotection for subdetector removal and installation, working with CMS safety officers and subdetector teams, operating in radioprotection-classified areas, and applying safety rules.
• Manage a mechanical workshop, advising and assisting CMS subdetector teams, ensuring the availability and proper use of equipment and tools, and supplying consumables.
• Provide technical support and hands-on assistance to CMS subdetector project teams operating within the CMS laboratories at CERN, in the fields of mechanical manufacturing, assembly, structures, and welding.
• Take part in the development, testing, on-site installation, and on-detector operation of custom tooling for subdetectors, working with subdetector technical teams.
• Operate and maintain hydraulic, mechanical, and electromechanical systems.
• Organise and supervise the storage of subdetector equipment in CMS-reserved spaces at CERN, ensuring proper inventory and space management.
• Assist the territorial safety officer of the building where the mechanical workshop is located, supervising work requested on infrastructure for general safety, and using a mobile crane and forklift when needed.
• Serve as the technical contact for mechanical activities with subdetector teams and for space areas under your responsibility, reporting regularly to the Technical Coordination managers.

• Higher technical diploma or equivalent relevant experience in the field of Mechanics or Manufacturing Methods or a related field.
• Trainings/certificates considered a plus: welding certificate, radioprotection formal training, hydraulic certificate.

Experience:

• Experience in radioprotection and the ability to work in classified areas.
• Proven ability to manage a mechanical workshop, including the use of standard machines and tools.
•  Strong organisational skills for coordinating teamwork and on-site technical activities.
• Proficiency in reading 2D and 3D technical drawings and manufacturing mechanical parts accordingly; experience in producing 2D and 3D drawings is an asset.
• Solid background in the design, construction, and assembly of mechanical components and customised tooling.
• Experience in the installation of structures and the use of specialised tooling for handling large equipment.
• Ability to work effectively within multidisciplinary teams.
• Proficiency with the operation and maintenance of hydraulic, mechanical, and electromechanical systems is considered a plus.

Technical competencies:

• Knowledge and application of manufacturing methods and work preparation.
• Assembly of mechanical structures and equipment.
• Manufacturing of mechanical parts.
• Integration of mechanical systems.
• Team management.
• Knowledge of regulatory framework and best practice in radiation protection.

Behavioural competencies:

• Achieving Results: defining clear objectives, milestones and deliverables before initiating work/ project.
• Communicating Effectively: ensuring that information, procedures and decisions are appropriately documented.
• Demonstrating Accountability: taking responsibility for own actions and decisions.
• Demonstrating Flexibility: being willing to work on different projects simultaneously.
• Working in Teams: building and maintaining constructive and effective work relationships.

Language skills:

Spoken and written English, with a commitment to learn French.

Eligibility and closing date:

Diversity has been an integral part of CERN's mission since its foundation and is an established value of the Organization. Employing a diverse workforce is central to our success. We welcome applications from all Member States and Associate Member States.

This vacancy will be filled as soon as possible, and applications should normally reach us no later than 28.05.2026 at 23:59 CEST. 

Employment Conditions:

Contract type: Limited duration contract (5 years). Subject to certain conditions, holders of limited-duration contracts may apply for an indefinite position.

Working Hours: 40 hours per week

Job Flexibility: Fully Onsite

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.
• Shift work, when required by the needs of the Organization.
• Exposure to lead.
• Radiation worker, category A.
• 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 grade: 3-4

Job reference: EP-CMS-IC-2026-97-LD

Field of work: Mechanical Engineering

Benchmark Job Title: Mechanical Technician

Global Benefits

• A competitive salary (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.

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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