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

Vitol is a leader in the energy sector with a presence across the spectrum: from oil through to power, renewables and carbon. From 40 offices worldwide, we seek to add value across the energy supply chain, including deploying our scale and market understanding to help facilitate the energy transition. To date, we have committed over $2 billion of capital to renewable projects, and are identifying and developing low-carbon opportunities around the world.

Our people are our business. Talent is precious to us and we create an environment in which individuals can reach their full potential, unhindered by hierarchy. Our team comprises more than 65 nationalities and we are committed to developing and sustaining a diverse work force. Learn more about us here.

Job Description

We are seeking a highly experienced Senior Systems Engineer with deep expertise in Microsoft Exchange and Enterprise Messaging, to join our Global Core Systems Infrastructure team in London or Geneva.

The role focuses primarily on the support, operation, design, and evolution of on-premises Exchange, while also covering the design and assessment of Exchange Online, hybrid messaging, and broader core infrastructure services. You will be critical in ensuring the availability, security, and performance of business-critical messaging systems, while contributing to the platform’s long-term strategy and potential cloud transformation.

Key Responsibilities

Messaging (Primary Focus)

With a global team, own and manage Microsoft Exchange (on-premises) as a core business-critical service. Supporting messaging and all related services
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

Core Infrastructure (Secondary Scope)

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
Platform & Operations
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
Leadership & Engineering Contribution
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
Drive improvements in automation, monitoring, and operational efficiency

Qualifications

Essential

• 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

Broader Infrastructure

• 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

Desirable

• 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

Soft Skills

• 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