Colin McLennan

Background

About Colin McLennan

Senior IT Systems Engineer with extensive experience across Microsoft 365, Exchange Online, secure email platforms and enterprise infrastructure. I specialise in operational support, messaging administration and service reliability, with a strong track record of troubleshooting complex issues and keeping business‑critical systems running in demanding environments.I’ve worked across large international organisations, public‑sector environments and high‑pressure manufacturing, supporting user bases from small businesses to global staff. My experience includes hybrid Exchange environments, Microsoft 365 migrations, Proofpoint administration, identity and access management, and a wide range of infrastructure technologies.I use PowerShell regularly for reporting, bulk operations and streamlining routine tasks, taking a practical, operational approach to automation that improves efficiency while maintaining safety and control.I value stable, well‑run organisations with strong teamwork and a healthy culture. I’m now looking for a senior engineering or operations role within a large public‑sector body or a mature private‑sector employer in the Belfast area.