Why Azure Teams Are Moving from ARM Templates to .NET

Sara Huddleston — Fri, 22 Aug 2025 01:41:10 +0000

Azure Resource Manager (ARM) templates are powerful, but painful. If you’ve ever tried to provision cloud infrastructure using ARM, you know the challenges:

Templates that started simple… and now span thousands of lines
Manual configuration stitched together with bespoke deployment logic
Lack of support for key services like Databricks
Slow, error-prone deployments that require multiple manual steps
No reuse, no testing, and no relief

ARM wasn’t built for the complexity of modern Azure workloads. If you’re already familiar with general-purpose languages, there’s a better path: Pulumi.

Top Pain Points of ARM Templates

Pain Point	ARM Templates	Pulumi (C#)
Language	JSON	C#, Python, TypeScript, or Go
Code Reuse	None—copy/paste only	Classes, functions, modules
Logic	Complex condition syntax	if / switch / for loops
IDE Support	Very limited	Full IntelliSense and refactoring
Testing	None	Unit tests with xUnit/NUnit
Debugging	Post-deploy troubleshooting	Step-through debugging in IDE
Refactoring	Manual edits	Standard IDE workflows

Pulumi: The Obvious Upgrade for .NET and Azure

Pulumi solves these problems at their root. It lets you define your Azure infrastructure using C#, the same language you’re already using to build your applications. With Pulumi, you get:

✅ Familiar programming languages ✅ Type safety and compile-time validation ✅ Full IDE support (IntelliSense, refactoring, debugging) ✅ Built-in support for Databricks, Kubernetes, and more ✅ Automated config and secrets management ✅ Easy testing, reuse, and CI/CD integration

From Static Templates to Software Engineering

Here’s an example of how different it is to build a storage account:

⛔ ARM Template (JSON)

{
 "$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
 "contentVersion": "1.0.0.0",
 "parameters": {
 "storageAccountName": {
 "type": "string",
 "metadata": { "description": "Globally unique, 3–24 lowercase letters and numbers." }
 }
 },
 "resources": [
 {
 "type": "Microsoft.Storage/storageAccounts",
 "apiVersion": "2021-09-01",
 "name": "[parameters('storageAccountName')]",
 "location": "[resourceGroup().location]",
 "sku": { "name": "Standard_LRS" },
 "kind": "StorageV2",
 "properties": {}
 }
 ],
 "outputs": {
 "storageAccountId": {
 "type": "string",
 "value": "[resourceId('Microsoft.Storage/storageAccounts', parameters('storageAccountName'))]"
 }
 }
}

✅ Azure with Pulumi in C#

using Pulumi;
using Pulumi.AzureNative.Storage;

class MyStack : Stack
{
 public MyStack()
 {
 var storageAccount = new StorageAccount("mystorage", new StorageAccountArgs
 {
 ResourceGroupName = "my-rg",
 Sku = new SkuArgs { Name = SkuName.Standard_LRS },
 Kind = Kind.StorageV2
 });
 }
}

It’s clean. It’s familiar. And it works seamlessly with your .NET tooling. Pulumi is open source, and your Pulumi Cloud account is free for individuals and small teams, with advanced editions for large enterprises. Try Pulumi Cloud for FREE->

Why It Just Works for .NET Teams

If your organization is built on Azure and .NET:

Use C# across both infrastructure and application layers
Share libraries and logic between services
Test infrastructure the same way you test code
Integrate with Azure DevOps and GitHub Actions
Manage secrets, environments, and policies as code

Pulumi supports all the Azure services ARM does (and more), while giving you flexibility and control ARM never could.

Summary

ARM templatesweren’t designed to scale with the complexity of today’s cloud environments. They’re static, verbose, hard to test, and increasingly brittle.

Pulumi gives you the tools to manage Azure the way you manage software: modular, testable, scalable, and secure.

If you’re already building with C# and .NET, you’re 90% of the way there. Why suffer through another slow, error-prone ARM deployment?

Pulumi Blog: Arm templates