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. 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 business‑critical operations.

Key Responsibilities

• 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 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

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 (on‑premises 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

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