Global System Administrator

We are seeking a highly experienced Senior System Administrator to support and evolve our hybrid onpremises and cloud infrastructure in a Genevabased international environment. This role requires strong expertise in Microsoft technologies Azure identity and security services and virtualization with a high standard of reliability and professionalism.

The position plays a critical role in ensuring availability security and compliance of core IT services supporting businesscritical operations.

Key Responsibilities

• Design implement and maintain Windows Server environments (onpremises 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 (onpremises hybrid and/or cloud)
• Manage Public Key Infrastructure (PKI) including certificate authorities and trust models
• Ensure certificate lifecycle management (TLS/SSL authentication encryption) across servers applications and services
• 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

Qualifications :

Required Technical Skills & Experience

• Several years of experience as a Senior System Administrator in an enterprise environment
• Strong hands-on expertise in:
  • Microsoft Azure
  • Microsoft Entra ID (Azure AD)
  • Microsoft 365 / Office 365
  • Windows Server
  • VMware / Vsphere
  • Active Directory & ADFS
  • DNS DHCP
  • Microsoft Exchange
  • PKI and certificate management
• Proven experience with hybrid (onpremises and cloud) infrastructures
• Solid understanding of identity authentication encryption and security principles
• Experience with PowerShell and automation is highly valued

Soft Skills & Personal Attributes

• Open-minded comfortable working in a multicultural international environment
• Reliable trusted to operate and support critical systems
• Flexible adaptable to changing priorities projects and operational needs
• Structured and methodical approach to problem-solving
• Strong communication skills in technical and business contexts
• Team player with a professional and service-oriented mindset

Languages

• English: professional working proficiency (required)
• French: working knowledge is a strong advantage

Additional Information :

Nice to Have

• Microsoft / Azure certifications
• Experience in regulated environments (finance trading healthcare international organizations)
• Familiarity with Swiss data protection and security standards
• Experience supporting international or multi-site infrastructures

Remote Work :

No

Employment Type :

Contract