80+ applications, 1 future-proof cloud platform: a major Flemish government organization migrates to Microsoft Azure

To meet these requirements, the team designed and implemented a completely new cloud architecture. The existing on-premise architecture couldn't meet the new security requirements, and a simple "lift-and-shift" wasn't enough. So the team built on foundations following the Microsoft Cloud Adoption Framework (CAF).

The team focused heavily on automation and security, using Infrastructure as Code (IaC with Terraform), Role-Based Access Control (RBAC), and strict policies. The team successfully set up the complex new IT landscape, which today includes a HUB VNet, dozens of networks, and no fewer than 50+ landing zones.

The success of this project came down to a combination of technical depth and close collaboration between the ACA project team and the client's staff. The numbers speak for themselves:

Despite the huge scale of the project, this professional approach meant only a handful of incidents occurred during the entire migration period.

The results of the hard work speak for themselves. Today, 95% of all applications are running successfully in the new PROD environment, and the organization is only a few weeks away from 100%.

The environment also became significantly safer and more robust. The Microsoft Azure Landing Zone Assessment score rose to 85%, and the Well-Architected Security Assessment achieved an excellent score.

The client now has complete insight into their architecture, connectivity, and operations (observability), and with FinOps up and running, there's tight, transparent control over IT budgets.

Thanks to this result and the strong partnership, the client is already looking further ahead. With clear goals for 2026, from cost reduction and multi-region approaches to introducing AI into DevOps processes, the platform is ready for its next step.