Scaling LogiTax from 50 to 1,200+ Customers with Kubernetes & KEDA

The "Before": A Scaling Wall and Deployment Anxiety LogiTax was trapped in the "Monolith VM" cycle. Their entire application lived on a single IIS server, sharing resources with dozens of background workers. A separate VM handled SQL, but the bottleneck wasn't the data - it was the architecture.

With 50 customers, the server was already gasping. To scale, they needed to run 60–80 background workers simultaneously. On a single VM, that’s not a scaling strategy; it’s a recipe for a total system crash.

The Challenges:

• Cost Inefficiency: Background workers ran 24/7, consuming CPU and RAM even when idle.
• Deployment Paralysis: Every update required manual intervention and planned downtime. No one was 100% sure what was in the build until it broke in production.
• The Scaling Ceiling: Adding more customers meant more manual VM management and increased risk of a single point of failure.

Architecture Re-imagined

We didn't just "lift and shift" the VMs. We broke the bottleneck by moving to a Cloud-Native, Event-Driven Architecture.

1. Intelligent Scaling with KEDA (Event-Driven Autoscaling)

The .NET Core background workers were the biggest resource hogs. We migrated them to Kubernetes (K8s), but with a twist. Instead of leaving 80 workers running 24/7, we implemented KEDA (Kubernetes Event-driven Autoscaling).

• The Logic: Workers now monitor an Azure Service Bus.
• The Action: If the queue is empty, the worker count drops to zero. When messages arrive, KEDA spins up the exact number of pods needed to handle the load.
• The Result: Massive cost savings and zero wasted compute.

2. Modernizing the Core with Windows Containers

The main ASP.NET application was migrated into Windows Containers on Kubernetes. This allowed us to:

• Standardize the environment (no more "it works on my machine").
• Enable horizontal pod autoscaling to handle traffic spikes.
• Isolate the web frontend from the heavy lifting of the background tasks.

3. Eliminating "Deployment Dread" with CI/CD

We replaced manual "copy-paste" deployments with fully automated CI/CD pipelines.

• Predictability: Every build is versioned and tested. We know exactly what is going into production.
• Zero Downtime: Using Kubernetes' rolling updates, we eliminated the need for maintenance windows. LogiTax can now deploy in the middle of a business day without a single customer noticing.