Senior Messaging & Core Infrastructure Engineer (Exchange and Messaging Specialist)

Job summary

Vitol is seeking a highly experienced Senior Systems Engineer with expertise in Microsoft Exchange and Enterprise Messaging to join their Global Core Systems Infrastructure team. The role involves supporting, operating, designing, and evolving on-premises Exchange systems, as well as contributing to the long-term strategy and potential cloud transformation of messaging services.

Qualifications

• Strong hands-on experience with Microsoft Exchange Server (on-premises), Exchange Online, and hybrid environments
• Enterprise messaging architecture and mail flow design, including transport rules, connectors, and message hygiene
• Mailbox migrations and coexistence strategies
• Messaging security (anti-spam, anti-phishing, encryption)
• Experience with PowerShell and automation
• Solid experience with Active Directory, Entra ID (Azure AD), Microsoft 365, and Windows Server administration
• Good working knowledge of VMware / vSphere infrastructure
• Understanding of identity, authentication, and security principles
• Familiarity with backup, DR, and monitoring platforms
• Experience leading Exchange Exchange Online migrations
• Exposure to large-scale, globally distributed environments
• Knowledge of mobile/messaging integration (e.g. Intune / mobile clients)
• Microsoft / M365 / VMware certifications
• Reliable and structured, able to operate critical systems with ownership
• Strong problem-solver with a methodical troubleshooting approach
• Clear communicator across technical and business stakeholders
• Comfortable working in a global, fast-paced environment
• Team player with a professional, service-oriented mindset

Responsibilities

• own and manage Microsoft Exchange (on-premises) as a core business-critical service
• Administer and support Exchange Online and hybrid configurations, including mail flow, transport, and coexistence
• Manage mailbox lifecycle, migrations, archiving, and retention policies
• Design and maintain secure mail flow, including anti-spam, anti-phishing, and encryption controls
• Troubleshoot complex messaging, transport, and client connectivity issues
• Lead or contribute to Exchange modernisation and migration initiatives
• Support Active Directory and Entra ID (Azure AD), including hybrid identity and authentication
• Administer Windows Server environments including DNS, DHCP, ADFS, Certificate Services
• Manage and maintain VMware virtualisation platforms, including performance, capacity, and lifecycle
• Support Microsoft 365 services including those related to messaging and collaboration
• Contribute to high availability, backup, and disaster recovery designs
• Ensure availability, performance, and resilience of messaging and core infrastructure
• Apply security best practices aligned with enterprise and regulatory requirements
• Participate in incident management and complex troubleshooting across infrastructure domains
• Maintain clear documentation, operational procedures, and system designs
• Support audits, compliance, and risk assessments
• Collaborate with global teams and stakeholders across regions
• Act as a subject matter expert (SME) for Exchange and messaging services
• Provide technical leadership and mentoring to other engineers
• Contribute to architecture, design decisions, and strategic roadmap planning

Skills

Relocation