Dennis Kappel
Professional

System Administrator

I work in IT operations with Windows infrastructure, Omnissa Horizon/VDI, Microsoft 365, Exchange, operational support, incidents and troubleshooting. Omnissa Horizon / VDIbuilt and maintained with a colleague Microsoft 365 / Exchangeadministration and support Windows infrastructureoperations and continuity Incidentstroubleshooting under real constraints Contact GitHub
Private / Hands-on

Private Infrastructure Lab

Linux · k3s · networking · automation Linux / Dockerservices I run and troubleshoot Kubernetes / k3simportant learning and practice area Networking / NetBirdprivate service access and routing Monitoring / automationGrafana, Prometheus, Git and runbooks
skill group

omnissa-horizon / former-vmware-horizon / vdi-environment

Together with a colleague, I helped build and maintain the VDI environment itself, not only support users on top of it.

  • Omnissa Horizon / VDI environment, formerly VMware Horizon
  • UAG and Connection Server setup and ongoing maintenance
  • golden images, snapshots and image lifecycle work
  • Veeam-backed backup paths for the surrounding infrastructure
  • built before my daily AI workflow; easier to review and document with AI now
skill group

microsoft-365 / exchange / windows

Professional operations around Microsoft 365, Exchange and Windows infrastructure, with the focus on administration, support and service continuity.

  • Microsoft 365 administration and user support
  • Exchange support in operational environments
  • Windows infrastructure troubleshooting under real constraints
operating mode

incidents / handover / repeatable-fixes

Incidents usually start with incomplete information, so the work is to identify the affected layer, verify assumptions and keep the next step recoverable.

  • operational support with real users waiting
  • clear notes for handover and future investigation
  • fixes that are understandable, not just lucky
current control

professional-ops / responsibility

My strongest professional ground is operating, maintaining and documenting the systems around Horizon/VDI, Microsoft 365, Exchange and Windows infrastructure, with a practical bias toward service continuity.