Junior Commissioning Engineer (EN-EL-MO-2026-50-GRAE)

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This CERN Junior Commissioning Engineer role is aimed at an early career electrical engineer eager for hands-on experience with HV and LV power systems, including testing, validation and commissioning across installations. You will lead or contribute to commissioning of HV/LV switchgears, transformers, circuit breakers, UPS systems and 48 V DC networks, prepare commissioning procedures and risk assessments, perform advanced tests such as protection relay secondary injection and interlocking validation, and coordinate with project teams while delivering clear commissioning reports. The ideal candidate holds a Bachelor’s or Master’s degree in electrical engineering or power systems, has basic knowledge of protection principles, and shows a strong willingness to learn in field environments; fluent English with a commitment to learn French. Eligibility includes being a CERN Member State national, no CERN fellowship or contract before, a maximum of two years of professional experience since graduation, and on-site 40 hours per week; medical clearance is required. To apply, tailor your CV to emphasize HV/LV experience, commissioning planning and testing, safety and risk assessments, and cross-functional collaboration, and highlight your readiness to work on site and your plan to learn French before the start date and by the 10 March 2026 deadline.

Job Description

Join CERN's Electrical Engineering group in a role suited to an early career electrical engineer seeking hands on experience with High Voltage and Low Voltage power systems, including testing, validation and commissioning. You will contribute to the deployment of electrical installations across CERN while developing your expertise in a world class technical environment.

Your responsibilities:

• Lead or contribute to commissioning activities for HV and LV switchgears, transformers, circuit breakers, UPS systems, 48 V DC systems and protection relays.
• Prepare commissioning procedures, test plans and risk assessments.
• Perform advanced commissioning tests, including protection relay secondary injection, logic validation, SCADA communication and interlocking functionality.
• Identify and resolve issues during commissioning and define corrective actions.
• Coordinate activities with project teams, operations teams and external suppliers.
• Produce clear commissioning reports and ensure proper integration into CERN documentation systems.

Your profile:

• You graduated in electrical engineering, power systems or related technical field.

Skills

• Basic knowledge of power system equipment and electrical protection principles.
• Motivated to learn commissioning practices in HV/LV environments.
• Strong analytical mindset, communication skills and willingness to work in field environments.
• 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 Electrical 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: 10.03.2026 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-June-2026

This position involves:

• Work during nights, Sundays and official holidays.
• Work in Radiation Areas.
• Interventions in underground installations.
• A valid driving licence.
• Stand-by duty, when required by the needs of the Organization.
• Work during nights, Sundays and official holidays, when required by the needs of the Organization.
• 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: EN-EL-MO-2026-50-GRAE

Field of work: Electrical or Electronics Engineering

Benchmark job: 301140 - Electrical Technical 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.

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