Assistant administratif construction – 50‑60% (Onex, Genève)

About the role

Implenia is looking for a part‑time Administrative Assistant to support its building services unit in Onex, Geneva. The position is 50‑60% and involves daily administrative and commercial tasks related to construction projects.

Key responsibilities

• Provide daily administrative support to the service team.
• Assist the commercial team in preparing offers and tender dossiers.
• Draft and manage correspondence.
• Assemble and file tender documentation.
• Handle creditor and debtor invoicing.
• Ensure compliance with internal procedures.
• Organise events and meetings as needed.

Required profile

• Good knowledge of the Swiss construction sector.
• Methodical, autonomous and able to work under pressure.
• Minimum five years of experience in a similar administrative/financial role.
• Commercial or higher education background.
• Strong oral and written communication skills in French.

Required skills

• Proficiency with Microsoft Office suite (Word, Excel, PowerPoint).

What we offer

• Multicultural work environment with opportunities to shape a sustainable future.
• Modern workplace, cutting‑edge technologies and flexible work models, including remote work options.
• 5 weeks of vacation plus 9 compensatory days per year.
• Internal pension fund with high coverage and multiple contribution levels.
• Discounts with renowned suppliers and continuous training programmes.