Infrastructure as Code: The Right Tool Matters
IaC is essential for reproducible, auditable infrastructure. But choosing between Terraform, Pulumi, and CloudFormation can be confusing. Here's an objective comparison.
Quick Comparison
| Factor | Terraform | Pulumi | CloudFormation |
|---|---|---|---|
| Multi-cloud | Excellent | Excellent | AWS only |
| Language | HCL | TypeScript/Python/Go | YAML/JSON |
| Learning curve | Medium | Low (if you know programming) | Medium |
| State management | Remote state | Pulumi Cloud/self-hosted | Managed by AWS |
| Community | Largest | Growing | Large (AWS-focused) |
When to Choose Terraform
- Multi-cloud strategy (AWS + GCP + Azure)
- Team familiar with declarative configuration
- Mature ecosystem with providers for everything
- Strong module ecosystem for common patterns
- Industry standard—easy to hire for
Terraform Example
resource "aws_instance" "web" {
ami = "ami-0c55b159cbfafe1f0"
instance_type = "t3.micro"
tags = {
Name = "WebServer"
}
}When to Choose Pulumi
- Team prefers real programming languages
- Complex logic in infrastructure (loops, conditions)
- Tight integration with application code
- TypeScript/Python expertise on the team
- Dislike of DSLs (domain-specific languages)
Pulumi Example (TypeScript)
const server = new aws.ec2.Instance("web", {
ami: "ami-0c55b159cbfafe1f0",
instanceType: "t3.micro",
tags: { Name: "WebServer" },
});When to Choose CloudFormation
- 100% AWS, no plans to change
- Tight integration with AWS services (StackSets, Service Catalog)
- Compliance requirements for AWS-native tooling
- No additional state management needed
The Hybrid Approach
Many teams use multiple tools:
- Terraform for core infrastructure
- CloudFormation for AWS-specific features (SAM, nested stacks)
- Pulumi for complex application infrastructure
Our Recommendation
For most European companies, we recommend Terraform because:
- Largest talent pool for hiring
- Most documentation and examples
- Multi-cloud flexibility for GDPR data residency requirements
- Stable and well-tested
Setting up Infrastructure as Code? We can help you get started right.