Global System Administrator

We are seeking a highly experienced Senior System Administrator to support and evolve our hybrid on‐premises and cloud infrastructure in a Geneva‐based, international environment.

Requirements

• Design, implement, and maintain Windows Server environments (on‐premises and cloud)
• Administer and optimize Microsoft Azure infrastructure and services
• Manage and support Microsoft 365 / Office 365, including Exchange Online and collaboration services
• Administer Microsoft Entra ID (Azure AD), including hybrid identity, synchronization, conditional access, and authentication policies
• Manage Active Directory, ADFS, DNS, and core identity services
• Operate and maintain VMware virtualization platforms
• Administer Microsoft Exchange environments (on‐premises, hybrid, and/or cloud)
• Manage Public Key Infrastructure (PKI), including certificate authorities and trust models
• Ensure high availability, backup, disaster recovery, monitoring, and capacity planning
• Troubleshoot complex infrastructure, identity, and authentication issues
• Apply security best practices in line with Swiss and international compliance requirements
• Participate in audits, risk assessments, and documentation efforts
• Collaborate closely with internal IT teams and international stakeholders
• Maintain clear technical documentation and operational procedures
• Provide technical leadership and mentoring to less experienced administrators