HR Assistant, Payroll & Administration

Constellium

Assistant HR role managing payroll and administrative tasks for Constellium Valais. Supporting HR processes with data management, reporting, and business partner assistance.

Posted 5/13/2026full-timeSierre • 🇨🇭 SwitzerlandJuniorMid-LevelWebsite

Tech Stack

Tools & technologies

ERP

About the role

Key responsibilities & impact

You are responsible for processing payroll.
You handle social insurance declarations.
You manage the administrative processes for employee onboarding and offboarding.
You maintain and manage our personnel databases.
You provide administrative support for various processes (e.g., annual qualifications/annual appraisals).
You assist HR Business Partners with administrative tasks and the preparation of statistics.
You monitor KPIs and maintain tracking reports.
You contribute to the smooth operation and quality of HR services (including participation in SOX audits).

Requirements

What you’ll need

You hold a Federal VET Certificate (CFC) as a commercial employee or an equivalent qualification; a certificate as an HR management assistant is an asset.
You have a minimum of 2–3 years' professional experience in payroll administration.
You are highly proficient in common IT tools (Word, Excel, PowerPoint, Adobe Acrobat, Outlook, Teams) and, ideally, experienced with HR ERP systems (SAP, SuccessFactors, HRS - HR Café).
You have excellent priority management and organizational skills, and a high sense of discretion and confidentiality.
You have a collaborative, supportive mindset and enjoy working in close partnership with a colleague.
You demonstrate rigor and flexibility and have a good ability to cope with stress.
You are a native French speaker; good knowledge of German or English is an asset.

Benefits

Comp & perks

A professional environment based on collaboration and trust.
Varied and diverse work.
Training opportunities (internal and external) and potential for increased responsibilities.
Opportunities to contribute to the development and continuous improvement of our HR processes.
Possibility to work part-time (reduced workload options).
Flexible work-time arrangements, including the option for some home office/remote work.
Various perks (free parking, on-site cafeteria; discounts and benefits with partner companies, etc.).

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills & Tools

payroll administrationsocial insurance declarationsemployee onboardingemployee offboardingKPI monitoringHR statistics preparationSOX audits

Soft Skills

priority managementorganizational skillsdiscretionconfidentialitycollaborative mindsetsupportive attituderigorflexibilitystress management

Certifications

Federal VET Certificate (CFC)HR management assistant certificate