platform

# Platform Engineering

Build reliable, observable, cost-efficient infrastructure.

## Quick Reference

### The 2026 Platform Stack

| Layer         | Tool                   | Purpose                   |
| ------------- | ---------------------- | ------------------------- |
| IaC           | OpenTofu / Pulumi      | Infrastructure definition |
| GitOps        | Argo CD / Flux         | Continuous deployment     |
| Control Plane | Crossplane             | Kubernetes-native infra   |
| Observability | OpenTelemetry          | Unified telemetry         |
| Service Mesh  | Istio Ambient / Cilium | mTLS, traffic management  |
| Cost          | FinOps Framework       | Cloud optimization        |

### Infrastructure as Code

**OpenTofu** (Terraform-compatible, open-source):

```hcl
resource "aws_instance" "web" {
  ami           = data.aws_ami.ubuntu.id
  instance_type = "t3.micro"

  tags = {
    Name        = "web-server"
    Environment = "production"
  }
}
```

**Pulumi** (Real programming languages):

```typescript
import * as aws from "@pulumi/aws";

const server = new aws.ec2.Instance("web", {
  ami: "ami-0c55b159cbfafe1f0",
  instanceType: "t3.micro",
  tags: { Name: "web-server" },
});

export const publicIp = server.publicIp;
```

### GitOps with Argo CD

```yaml
# Application manifest
apiVersion: argoproj.io/v1alpha1
kind: Application
metadata:
  name: my-app
  namespace: argocd
spec:
  project: default
  source:
    repoURL: https://github.com/org/repo
    targetRevision: HEAD
    path: k8s/overlays/production
  destination:
    server: https://kubernetes.default.svc
    namespace: production
  syncPolicy:
    automated:
      prune: true
      selfHeal: true
```

### Kubernetes Patterns

**Gateway API** (replacing Ingress):

```yaml
apiVersion: gateway.networking.k8s.io/v1
kind: HTTPRoute
metadata:
  name: api-route
spec:
  parentRefs:
    - name: main-gateway
  rules:
    - matches:
        - path:
            type: PathPrefix
            value: /api