Azure Cloud Architect

# Azure Cloud Architect

Design scalable, cost-effective Azure architectures for startups and enterprises with Bicep infrastructure-as-code templates.

---

## Workflow

### Step 1: Gather Requirements

Collect application specifications:

```
- Application type (web app, mobile backend, data pipeline, SaaS, microservices)
- Expected users and requests per second
- Budget constraints (monthly spend limit)
- Team size and Azure experience level
- Compliance requirements (GDPR, HIPAA, SOC 2, ISO 27001)
- Availability requirements (SLA, RPO/RTO)
- Region preferences (data residency, latency)
```

### Step 2: Design Architecture

Run the architecture designer to get pattern recommendations:

```bash
python scripts/architecture_designer.py \
  --app-type web_app \
  --users 10000 \
  --requirements '{"budget_monthly_usd": 500, "compliance": ["SOC2"]}'
```

**Example output:**

```json
{
  "recommended_pattern": "app_service_web",
  "service_stack": ["App Service", "Azure SQL", "Front Door", "Key Vault", "Entra ID"],
  "estimated_monthly_cost_usd": 280,
  "pros": ["Managed platform", "Built-in autoscale", "Deployment slots"],
  "cons": ["Less control than VMs", "Platform constraints", "Cold start on consumption plans"]
}
```

Select from recommended patterns:
- **App Service Web**: Front Door + App Service + Azure SQL + Redis Cache
- **Microservices on AKS**: AKS + Service Bus + Cosmos DB + API Management
- **Serverless Event-Driven**: Functions + Event Grid + Service Bus + Cosmos DB
- **Data Pipeline**: Data Factory + Synapse Analytics + Data Lake Storage + Event Hubs

See `references/architecture_patterns.md` for detailed pattern specifications.

**Validation checkpoint:** Confirm the recommended pattern matches the team's operational maturity and compliance requirements before proceeding to Step 3.

### Step 3: Generate IaC Templates

Create infrastructure-as-code for the selected pattern:

```bash
# Web app stack (Bicep)
python scripts/bicep_generator.py --arch-type web-app --output main.bicep
```

**Example Bicep output (core web app resources):**

```bicep
@description('The environment name')
param environment string = 'dev'

@description('The Azure region for resources')
param location string = resourceGroup().location

@description('The application name')
param appName string = 'myapp'

// App Service Plan
resource appServicePlan 'Microsoft.Web/serverfarms@2023-01-01' = {
  name: '${environment}-${appName}-plan'
  location: location
  sku: {
    name: 'P1v3'
    tier: 'PremiumV3'
    capacity: 1
  }
  properties: {
    reserved: true // Linux
  }
}

// App Service
resource appService 'Microsoft.Web/sites@2023-01-01' = {
  name: '${environment}-${appName}-web'
  location: location
  properties: {
    serverFarmId: appServicePlan.id
    httpsOnly: true
    siteConfig: {
      linuxFxVersion: 'NODE|20-lts'
      minTlsVersion: '1.2'
      ftpsState: 'Disabled'
      alwaysOn: true
    }
  }
  identity: {
    type: 'SystemAssigned'
  }
}

// Azure SQL Database
resource sqlServer 'Microsoft.Sql/servers@2023-05-01-preview' = {
  name: '${environment}-${appName}-sql'
  location: location
  properties: {
    administrators: {
      azureADOnlyAuthentication: true
    }
    minimalTlsVersion: '1.2'
  }
}

resource sqlDatabase 'Microsoft.Sql/servers/databases@2023-05-01-preview' = {
  parent: sqlServer
  name: '${appName}-db'
  location: location
  sku: {
    name: 'GP_S_Gen5_2'
    tier: 'GeneralPurpose'
  }
  properties: {
    autoPauseDelay: 60
    minCapacity: json('0.5')
  }
}
```

> Full templates including Front Door, Key Vault, Managed Identity, and monitoring are generated by `bicep_generator.py` and also available in `references/architecture_patterns.md`.

**Bicep is the recommended IaC language for Azure.** Prefer Bicep over ARM JSON templates: Bicep compiles to ARM JSON, has cleaner syntax, supports modules, and is first-party supported by Microsoft.

### Step 4: Review Costs

Analyze estimated costs and optimization opportunities:

```bash
python scripts/cost_optimizer.py \
  --config current_resources.json \
  --json
```

**Example output:**

```json
{
  "current_monthly_usd": 2000,
  "recommendations": [
    { "action": "Right-size SQL Database GP_S_Gen5_8 to GP_S_Gen5_2", "savings_usd": 380, "priority": "high" },
    { "action": "Purchase 1-year Reserved Instances for AKS node pools", "savings_usd": 290, "priority": "high" },
    { "action": "Move Blob Storage to Cool tier for objects >30 days old", "savings_usd": 65, "priority": "medium" }
  ],
  "total_potential_savings_usd": 735
}
```

Output includes:
- Monthly cost breakdown by service
- Right-sizing recommendations
- Reserved Instance and Savings Plan opportunities
- Potential monthly savings

### Step 5: Configure CI/CD

Set up Azure DevOps Pipelines or GitHub Actions with Azure:

```yaml
# GitHub Actions — deploy Bicep to Azure
name: Deploy Infrastructure
on:
  push:
    branches: [main]

permissions:
  id-token: write
  contents: read

jobs:
  deploy:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4

      - uses: azure/login@v2
        with:
          client-id: ${{ secrets.AZURE_CLIENT_ID }}
          tenant-id: ${{ secrets.AZURE_TENANT_ID }}
          subscription-id: ${{ secrets.AZURE_SUBSCRIPTION_ID }}

      - uses: azure/arm-deploy@v2
        with:
          resourceGroupName: rg-myapp-dev
          template: ./infra/main.bicep
          parameters: environment=dev
```

```yaml
# Azure DevOps Pipeline
trigger:
  branches:
    include:
      - main

pool:
  vmImage: 'ubuntu-latest'

steps:
  - task: AzureCLI@2
    inputs:
      azureSubscription: 'MyServiceConnection'
      scriptType: 'bash'
      scriptLocation: 'inlineScript'
      inlineScript: |
        az deployment group create \
          --resource-group rg-myapp-dev \
          --template-file infra/main.bicep \
          --parameters environment=dev
```

### Step 6: Security Review

Validate security posture before production:

- **Identity**: Entra ID (Azure AD) with RBAC, Managed Identity for service-to-service auth — never store credentials in code
- **Secrets**: Key Vault for all secrets, certificates, and connection strings
- **Network**: NSGs on all subnets, Private Endpoints for PaaS services, Application Gateway with WAF
- **Encryption**: TLS 1.2+ in transit, Azure-managed or customer-managed keys at rest
- **Monitoring**: Microsoft Defender for Cloud enabled, Azure Policy for guardrails
- **Compliance**: Azure Policy assignments for SOC 2 / HIPAA / ISO 27001 initiatives

**If deployment fails:**

1. Check the deployment status:
   ```bash
   az deployment group show \
     --resource-group rg-myapp-dev \
     --name main \
     --query 'properties.error'
   ```
2. Review Activity Log for RBAC or policy errors.
3. Validate the Bicep template before deploying:
   ```bash
   az bicep build --file main.bicep
   az deployment group validate \
     --resource-group rg-myapp-dev \
     --template-file main.bicep
   ```

**Common failure causes:**
- RBAC permission errors — verify the deploying principal has Contributor on the resource group
- Resource provider not registered — run `az provider register --namespace Microsoft.Web`
- Naming conflicts — Azure resource names are often globally unique (storage accounts, web apps)
- Quota exceeded — request quota increase via Azure Portal > Subscriptions > Usage + quotas

---

## Tools

### architecture_designer.py

Generates architecture pattern recommendations based on requirements.

```bash
python scripts/architecture_designer.py \
  --app-type web_app \
  --users 50000 \
  --requirements '{"budget_monthly_usd": 1000, "compliance": ["HIPAA"]}' \
  --json
```

**Input:** Application type, expected users, JSON requirements
**Output:** Recommended pattern, service stack, cost estimate, pros/cons

### cost_optimizer.py

Analyzes Azure resource configurations for cost savings.

```bash
python scripts/cost_optimizer.py --config resources.json --json
```

**Input:** JSON file with current Azure resource inventory
**Output:** Recommendations for:
- Idle resource removal
- VM and database right-sizing
- Reserved Instance purchases
- Storage tier transitions
- Unused public IPs and load balancers

### bicep_generator.py

Generates Bicep template scaffolds from architecture type.

```bash
python scripts/bicep_generator.py --arch-type microservices --output main.bicep
```

**Output:** Production-ready Bicep templates with:
- Managed Identity (no passwords)
- Key Vault integration
- Diagnostic settings for Azure Monitor
- Network security groups
- Tags for cost allocation

---

## Quick Start

### Web App Architecture (< $100/month)

```
Ask: "Design an Azure web app for a startup with 5000 users"

Result:
- App Service (B1 Linux) for the application
- Azure SQL Serverless for relational data
- Azure Blob Storage for static assets
- Front Door (free tier) for CDN and routing
- Key Vault for secrets
- Estimated: $40-80/month
```

### Microservices on AKS ($500-2000/month)

```
Ask: "Design a microservices architecture on Azure for a SaaS platform with 50k users"

Result:
- AKS cluster with 3 node pools (system, app, jobs)
- API Management for gateway and rate limiting
- Cosmos DB for multi-model data
- Service Bus for async messaging
- Azure Monitor + Application Insights for observability
- Multi-zone deployment
```

### Serverless Event-Driven (< $200/month)

```
Ask: "Design an event-driven backend for processing orders"

Result:
- Azure Functions (Consumption plan) for compute
- Event Grid for event routing
- Service Bus for reliable messaging
- Cosmos DB for order data
- Application Insights for monitoring
- Estimated: $30-150/month depending on volume
```

### Data Pipeline ($300-1500/month)

```
Ask: "Design a data pipeline for ingesting 10M events/day"

Result:
- Event Hubs for ingestion
- Stream Analytics or Functions for processing
- Data Lake Storage Gen2 for raw data
- Synapse Analytics for warehouse
- Power BI for dashboards
```

---

## Input Requirements

Provide these details for architecture design:

| Requirement | Description | Example |
|-------------|-------------|---------|
| Application type | What you're building | SaaS platform, mobile backend |
| Expected scale | Users, requests/sec | 10k users, 100 RPS |
| Budget | Monthly Azure limit | $500/month max |
| Team context | Size, Azure experience | 3 devs, intermediate |
| Compliance | Regulatory needs | HIPAA, GDPR, SOC 2 |
| Availability | Uptime requirements | 99.9% SLA, 1hr RPO |

**JSON Format:**

```json
{
  "application_type": "saas_platform",
  "expected_users": 10000,
  "requests_per_second": 100,
  "budget_monthly_usd": 500,
  "team_size": 3,
  "azure_experience": "intermediate",
  "compliance": ["SOC2"],
  "availability_sla": "99.9%"
}
```

---

## Anti-Patterns

| Anti-Pattern | Why It Fails | Do This Instead |
|---|---|---|
| ARM JSON templates for new projects | Verbose, hard to read, no modules | Use Bicep — compiles to ARM, cleaner syntax |
| Storing secrets in App Settings | Secrets visible in portal, no rotation | Use Key Vault references in App Settings |
| Single large AKS node pool | Cannot optimize for different workloads | Use multiple node pools: system, app, jobs |
| Public endpoints on PaaS services | Exposed attack surface | Use Private Endpoints + VNet integration |
| Over-provisioning "just in case" | Wastes budget month one | Start small, use autoscale, right-size monthly |
| Shared resource groups for everything | Blast radius, RBAC nightmares | One resource group per environment per workload |
| No tagging strategy | Cannot track costs or ownership | Tag: environment, owner, cost-center, app-name |
| Using classic resources | Deprecated, limited features | Use ARM/Bicep resources exclusively |

---

## Output Formats

### Architecture Design

- Pattern recommendation with rationale
- Service stack diagram (ASCII)
- Monthly cost estimate and trade-offs

### IaC Templates

- **Bicep**: Recommended — first-party, module support, clean syntax
- **ARM JSON**: Generated from Bicep when needed
- **Terraform HCL**: Multi-cloud compatible using azurerm provider

### Cost Analysis

- Current spend breakdown with optimization recommendations
- Priority action list (high/medium/low) and implementation checklist

---

## Cross-References

| Skill | Relationship |
|-------|-------------|
| `engineering-team/aws-solution-architect` | AWS equivalent — same 6-step workflow, different services |
| `engineering-team/gcp-cloud-architect` | GCP equivalent — completes the cloud trifecta |
| `engineering-team/senior-devops` | Broader DevOps scope — pipelines, monitoring, containerization |
| `engineering/terraform-patterns` | IaC implementation — use for Terraform modules targeting Azure |
| `engineering/ci-cd-pipeline-builder` | Pipeline construction — automates Azure DevOps and GitHub Actions |

---

## Reference Documentation

| Document | Contents |
|----------|----------|
| `references/architecture_patterns.md` | 5 patterns: web app, microservices/AKS, serverless, data pipeline, multi-region |
| `references/service_selection.md` | Decision matrices for compute, database, storage, messaging, networking |
| `references/best_practices.md` | Naming conventions, tagging, RBAC, network security, monitoring, DR |