Job Description The EP-ATL-PO section plays a key role in the upgrade and maintenance of the ATLAS detector at the LHC. As a Junior Mechanical Technician, you will support experienced colleagues in mechanical installation and integration activities on the detector and its infrastructure during Long Shutdown 3 (LS3), while gaining hands‑on experience in a cutting‑edge experimental physics environment.
Responsibilities
Participate in large-scale ATLAS detector movements in the experimental cavern and in the installation of access platforms.
Support sub‑detector installation activities, including handling, transport, and positioning using appropriate lifting and alignment techniques.
Prepare and set up work areas and tooling, and provide logistical support for detector interventions.
Read and interpret mechanical drawings, perform basic dimensional checks, and report progress to supervising engineers.
When required, manufacture parts and tooling using conventional machining techniques, such as drilling, milling, and turning.
Profile / Qualifications
Initial hands‑on experience in mechanical assembly, fitting, or maintenance.
Ability to read and interpret mechanical drawings, blueprints, and 2D/3D CAD models.
Initial experience with conventional machining techniques and workshop practices.
Basic metrology skills, including the use of calipers, gauges, and dimensional inspection tools.
Awareness of occupational health and safety principles in workshop and industrial environments.
Skills
Follow technical procedures, assembly instructions, and work specifications.
Use of standard hand and power tools for mechanical operations.
Strong teamwork and communication skills, with the ability to collaborate in an international and multidisciplinary environment.
Rigorous, detail‑oriented, and safety‑conscious approach to work.
Accurately document completed work and maintain high quality standards while following technical procedures and safety requirements.
Spoken and written English or French, with a commitment to learn the basics of the other language.
Eligibility Criteria
National of a CERN Member or Associate Member State.
Maximum two years of professional experience since graduation in Mechanical Engineering or equivalent (or a related field) and highest educational qualification is a general secondary education diploma.
Never had a CERN fellow or graduate contract before.
Applicants with a Bachelor's, Master's or PhD degree are not eligible.
Additional Information Job closing date: 23.07.2026 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: Fully onsite. Target start date: 01-November-2026.
Job involves: • Work in radiation areas. • Interventions in underground installations. • A valid driving licence. • Work during nights, Sundays and official holidays, when required. • Exposure to risk of falling from heights during scaffolding assembly and dismantling operations.
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-ATL-PO-2026-178-GRAE Field of work: Mechanical Engineering Benchmark job: 300090 - Mechanical Technician
Global Benefits
A monthly stipend of 4687 Swiss Francs per month (tax free).
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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Responsibilities
Participate in large-scale ATLAS detector movements in the experimental cavern and in the installation of access platforms.
Support sub‑detector installation activities, including handling, transport, and positioning using appropriate lifting and alignment techniques.
Prepare and set up work areas and tooling, and provide logistical support for detector interventions.
Read and interpret mechanical drawings, perform basic dimensional checks, and report progress to supervising engineers.
When required, manufacture parts and tooling using conventional machining techniques, such as drilling, milling, and turning.
Profile / Qualifications
Initial hands‑on experience in mechanical assembly, fitting, or maintenance.
Ability to read and interpret mechanical drawings, blueprints, and 2D/3D CAD models.
Initial experience with conventional machining techniques and workshop practices.
Basic metrology skills, including the use of calipers, gauges, and dimensional inspection tools.
Awareness of occupational health and safety principles in workshop and industrial environments.
Skills
Follow technical procedures, assembly instructions, and work specifications.
Use of standard hand and power tools for mechanical operations.
Strong teamwork and communication skills, with the ability to collaborate in an international and multidisciplinary environment.
Rigorous, detail‑oriented, and safety‑conscious approach to work.
Accurately document completed work and maintain high quality standards while following technical procedures and safety requirements.
Spoken and written English or French, with a commitment to learn the basics of the other language.
Eligibility Criteria
National of a CERN Member or Associate Member State.
Maximum two years of professional experience since graduation in Mechanical Engineering or equivalent (or a related field) and highest educational qualification is a general secondary education diploma.
Never had a CERN fellow or graduate contract before.
Applicants with a Bachelor's, Master's or PhD degree are not eligible.
Additional Information Job closing date: 23.07.2026 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: Fully onsite. Target start date: 01-November-2026.
Job involves: • Work in radiation areas. • Interventions in underground installations. • A valid driving licence. • Work during nights, Sundays and official holidays, when required. • Exposure to risk of falling from heights during scaffolding assembly and dismantling operations.
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-ATL-PO-2026-178-GRAE Field of work: Mechanical Engineering Benchmark job: 300090 - Mechanical Technician
Global Benefits
A monthly stipend of 4687 Swiss Francs per month (tax free).
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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