System Engineer — Technical Expert M365 Exchange
Function title
System Engineer (SYSE) — Technical Expert M365 Exchange
Service Center
IT Service Center Communication & Collaboration (Colruyt Group IT)
As a Technical Expert M365 Exchange, you take a key role in the set-up, rollout, expansion and operational support of Microsoft Exchange within the IT Service Center Communication & Collaboration. You actively contribute to the transition from a custom-built, on-premises mail and calendar solution to Exchange Online and a Microsoft-centred digital workplace.
Like every system engineer at Colruyt Group, you make sure IT systems work together optimally. You monitor, support, build, integrate and manage your assigned infrastructure system in a customer-oriented, efficient and effective way, so the continuity and secure and proper functioning of the enterprise mail platforms are guaranteed in the long run.
The role combines project work, technical configuration, automation and operational responsibility within a large-scale, business-critical Microsoft 365 environment.
Build & projects (system builder)
Act as technical specialist for the rollout and support of the Exchange Online environment.
Actively participate in projects for the expansion and rollout of Exchange Online — including configuration, automation (e.g. PowerShell, scripting) and integration with other Microsoft 365 services and surrounding systems.
Contribute to the migration and transition from the on-premises, custom-built mail & calendar platform to Exchange Online, helping to ensure a stable and scalable cloud environment.
Operations & lifecycle management (system manager)
Co-design and implement a robust operational and support model for Hybrid Exchange (Exchange Server SE) and Exchange Online within the Service Center.
Support the full life cycle of the solution: install and maintain the environment (release notes, testing, bugfixes) and proactively monitor the systems, reporting observations and KPIs to the stakeholders involved.
Draw up optimization proposals and report your findings to the application manager.
Incident & support management
Provide 2nd- and 3rd-line technical support for Exchange within the Service Center.
Analyse incidents and complex issues, pro-actively propose structural improvements, and ensure correct handling and follow-up according to priorities, SLAs and SLEs.
Change & knowledge management
Prepare, plan and execute changes according to the change process, providing fall-back procedures and documentation.
Document solutions, configurations and operational procedures, and build up the knowledge base.
Share your M365 Exchange knowledge with colleagues and help raise the overall expertise level within the Service Center.
Collaboration & Stakeholder management
Work closely with colleagues across Communication & Collaboration, projects and operations, and act as point of contact for the assigned system.
Have close contact with architects, system engineers, and other 3rd line profiles.
Frequent alignment with internal stakeholders like our business contacts, product owners, operations and other IT teams.
Education & experience
More than 7 years of experience as a System Engineer or in a similar technical role in M365 Exchange.
Strong hands-on experience with Microsoft 365 and Exchange Online administration in enterprise environments.
Technical expertise
In-depth knowledge of Microsoft Exchange Online, Exchange Server SE and Hybrid Exchange deployments in enterprise environments.
Deep knowledge of mail flow and SMTP routing, email security and authentication (SPF, DKIM, DMARC), mail delivery and troubleshooting.
Strong experience with Exchange mail flow components, including connectors, transport rules, MX records and message trace analysis.
Experience in mail security investigations, incident analysis and troubleshooting of complex messaging environments.
Advanced PowerShell scripting skills, including automation, reporting, lifecycle management and Microsoft Graph integration.
Proven experience with Exchange Hybrid deployments, coexistence scenarios and migrations from on-premises messaging environments to Exchange Online.
Familiarity with Azure Communication Services (ACS) and its integration with Microsoft 365 communication and messaging solutions.
Competencies & working style
Analytical — you keep oversight and focus on the main lines without losing sight of the details and establish connections between data.
Problem-solving — you enjoy tackling complex incidents and translating them into sustainable solutions. You are quick to make decisions in critical incidents and escalate at the right time.
Adaptable & innovation-oriented — you keep up with the fast-evolving Microsoft 365 landscape and proactively identify improvement opportunities.
Versatile — you feel comfortable in both a project-based and an operational context.
Autonomous & collaborative — you can work independently while being a genuine team player.
Communicative — you communicate clearly with both technical and non-technical stakeholders.
Ownership — you take end-to-end responsibility for the stability, security and quality of the mail platforms. You are proactive in identifying risks and challenging decisions. You continuously develop your own craftsmanship and know-how.
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