Brussels, BE

I'm Stijn Callebaut, COO at DexMach. I like running, the outdoors, a good book from time to time and lego. At DexMach I help put focus on operational excellence, and I engage in customers cloud journeys to have direct feedback.

Work experience


Head of operations - COO | 2022 - Current

Stijn drives operational excellence at DexMach services, both professional and managed services. He believes openness and inclusiveness is key for organizational and professional growth.

Chief Technology Officer | 2019 - 2022

Stijn helps put focus on the technology that matters and he engages in customers cloud journey's to have direct feedback. He is the main driver behind the Azure Expert MSP and Advanced specialization audits, which we obtained several years in a row now. The change to git driven operations (gitops) enabled us to scale beyond people and enabling us to focus on human interactions to improve our services and interactions with clients.

Solution Architect | 2017 - 2019

Full focus on Azure consultancy. Founder of the dexbrix catalog - a set of standardized services deployable cross tenants (customers).

Consultant | 2012 - 2017

Consultant with a focus on System Center Service Manager (SCSM), Microsoft's ITSM tooling. Embracing SCSM meant a shift from technical implementations to understanding business requests, with a strong focus on standardization. The last couple of years, my focus shifted to incorporating Azure, with a first highlight of Platform as a Service (PaaS).


Senior Analyst | 2011 - 2012

Providing Microsoft focused consultancy, ranging from IAM services (Forefront Identity Manager) to Device management (Configuration Manager).


Operations Engineer | 2005 - 2011

Providing operational long term support for customers. First at Procter & Gamble with a focus on networking and Novell for the BeNeLux sites - Brussels, Mechelen, Rotterdam and Coevoorden. After a couple of years I moved to a Microsoft Configuration Manager focused role at Engie Electrabel Brussels and Antwerp.


Microsoft PAC - Azure Infrastructure

Active member | 2021 - Current

As one of the 20 global Partner Advisory Council (PAC) members Stijn provides valuable insights that increase the success of Microsoft products, services and field engagement through ongoing feedback and twice-annual PAC meetings

  • provide input and feedback on product and solution direction, business model development, roadmap and sales and marketing execution
  • foster exchange of ideas and information between partners and Microsoft
  • drive interaction with partners to deliver One Microsoft

Belgian PowerShell User Group (BEPUG)

Community organizer | 2018 - Current

The Belgian PowerShell user group (BEPUG) brings Belgian PowerShell enthousiasts together. Our goal is bring people with a powershell interest together so we stimulate learning in a social and open environment.

System Center User Group Belgium (SCUG)- now beemug

Active member | 2011 - 2018

As an active member I help in organizing events and actively contribute in speaking engagements


Dutch: Native language

French: Good

English: Good


Cloud platform

  • Azure
  • FinOps
  • Architecture
  • Monitoring
  • Automation
  • Azure Resource Manager (ARM)
  • IaaS
  • PaaS
  • GitOps
  • Kubernetes (AKS)
  • Security
  • Cloud Native
  • Serverless


  • GitOps (flux, flagger)
  • Service Mesh (istio, open service mesh)
  • Container security
  • Admission Controller (OPA gatekeeper)
  • Container runtime security
  • Docker


  • Bash
  • PowerShell
  • Python


  • Azure DevOps
  • Github
  • Sprint planning
  • CI/CD
  • Security
  • Gitflow

Soft skills

  • Team player
  • Coaching
  • Collaboration
  • Planning
  • Ownership
  • Integrity