claude-skills-reference/engineering-team/gcp-cloud-architect/SKILL.md

name, description

name	description
gcp-cloud-architect	Design GCP architectures for startups and enterprises. Use when asked to design Google Cloud infrastructure, deploy to GKE or Cloud Run, configure BigQuery pipelines, optimize GCP costs, or migrate to GCP. Covers Cloud Run, GKE, Cloud Functions, Cloud SQL, BigQuery, and cost optimization.

GCP Cloud Architect

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

---

Workflow

Step 1: Gather Requirements

Collect application specifications:

- Application type (web app, mobile backend, data pipeline, SaaS)
- Expected users and requests per second
- Budget constraints (monthly spend limit)
- Team size and GCP experience level
- Compliance requirements (GDPR, HIPAA, SOC 2)
- Availability requirements (SLA, RPO/RTO)

Step 2: Design Architecture

Run the architecture designer to get pattern recommendations:

python scripts/architecture_designer.py --input requirements.json

Example output:

{
  "recommended_pattern": "serverless_web",
  "service_stack": ["Cloud Storage", "Cloud CDN", "Cloud Run", "Firestore", "Identity Platform"],
  "estimated_monthly_cost_usd": 30,
  "pros": ["Low ops overhead", "Pay-per-use", "Auto-scaling", "No cold starts on Cloud Run min instances"],
  "cons": ["Vendor lock-in", "Regional limitations", "Eventual consistency with Firestore"]
}

Select from recommended patterns:

• Serverless Web: Cloud Storage + Cloud CDN + Cloud Run + Firestore
• Microservices on GKE: GKE Autopilot + Cloud SQL + Memorystore + Cloud Pub/Sub
• Serverless Data Pipeline: Pub/Sub + Dataflow + BigQuery + Looker
• ML Platform: Vertex AI + Cloud Storage + BigQuery + Cloud Functions

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: Estimate Cost

Analyze estimated costs and optimization opportunities:

python scripts/cost_optimizer.py --resources current_setup.json --monthly-spend 2000

Example output:

{
  "current_monthly_usd": 2000,
  "recommendations": [
    { "action": "Right-size Cloud SQL db-custom-4-16384 to db-custom-2-8192", "savings_usd": 380, "priority": "high" },
    { "action": "Purchase 1-yr committed use discount for GKE nodes", "savings_usd": 290, "priority": "high" },
    { "action": "Move Cloud Storage objects >90 days to Nearline", "savings_usd": 75, "priority": "medium" }
  ],
  "total_potential_savings_usd": 745
}

Output includes:

• Monthly cost breakdown by service
• Right-sizing recommendations
• Committed use discount opportunities
• Sustained use discount analysis
• Potential monthly savings

Use the GCP Pricing Calculator for detailed estimates.

Step 4: Generate IaC

Create infrastructure-as-code for the selected pattern:

python scripts/deployment_manager.py --app-name my-app --pattern serverless_web --region us-central1

Example Terraform HCL output (Cloud Run + Firestore):

terraform {
  required_providers {
    google = {
      source  = "hashicorp/google"
      version = "~> 5.0"
    }
  }
}

provider "google" {
  project = var.project_id
  region  = var.region
}

variable "project_id" {
  description = "GCP project ID"
  type        = string
}

variable "region" {
  description = "GCP region"
  type        = string
  default     = "us-central1"
}

resource "google_cloud_run_v2_service" "api" {
  name     = "${var.environment}-${var.app_name}-api"
  location = var.region

  template {
    containers {
      image = "gcr.io/${var.project_id}/${var.app_name}:latest"
      resources {
        limits = {
          cpu    = "1000m"
          memory = "512Mi"
        }
      }
      env {
        name  = "FIRESTORE_PROJECT"
        value = var.project_id
      }
    }
    scaling {
      min_instance_count = 0
      max_instance_count = 10
    }
  }
}

resource "google_firestore_database" "default" {
  project     = var.project_id
  name        = "(default)"
  location_id = var.region
  type        = "FIRESTORE_NATIVE"
}

Example gcloud CLI deployment:

# Deploy Cloud Run service
gcloud run deploy my-app-api \
  --image gcr.io/$PROJECT_ID/my-app:latest \
  --region us-central1 \
  --platform managed \
  --allow-unauthenticated \
  --memory 512Mi \
  --cpu 1 \
  --min-instances 0 \
  --max-instances 10

# Create Firestore database
gcloud firestore databases create --location=us-central1

Full templates including Cloud CDN, Identity Platform, IAM, and Cloud Monitoring are generated by deployment_manager.py and also available in references/architecture_patterns.md.

Step 5: Configure CI/CD

Set up automated deployment with Cloud Build or GitHub Actions:

# cloudbuild.yaml
steps:
  - name: 'gcr.io/cloud-builders/docker'
    args: ['build', '-t', 'gcr.io/$PROJECT_ID/my-app:$COMMIT_SHA', '.']

  - name: 'gcr.io/cloud-builders/docker'
    args: ['push', 'gcr.io/$PROJECT_ID/my-app:$COMMIT_SHA']

  - name: 'gcr.io/google.com/cloudsdktool/cloud-sdk'
    entrypoint: gcloud
    args:
      - 'run'
      - 'deploy'
      - 'my-app-api'
      - '--image=gcr.io/$PROJECT_ID/my-app:$COMMIT_SHA'
      - '--region=us-central1'
      - '--platform=managed'

images:
  - 'gcr.io/$PROJECT_ID/my-app:$COMMIT_SHA'

# Connect repo and create trigger
gcloud builds triggers create github \
  --repo-name=my-app \
  --repo-owner=my-org \
  --branch-pattern="^main$" \
  --build-config=cloudbuild.yaml

Step 6: Security Review

Verify security configuration:

# Review IAM bindings
gcloud projects get-iam-policy $PROJECT_ID --format=json

# Check service account permissions
gcloud iam service-accounts list --project=$PROJECT_ID

# Verify VPC Service Controls (if applicable)
gcloud access-context-manager perimeters list --policy=$POLICY_ID

Security checklist:

• IAM roles follow least privilege (prefer predefined roles over basic roles)
• Service accounts use Workload Identity for GKE
• VPC Service Controls configured for sensitive APIs
• Cloud KMS encryption keys for customer-managed encryption
• Cloud Audit Logs enabled for all admin activity
• Organization policies restrict public access
• Secret Manager used for all credentials

If deployment fails:

1. Check the failure reason:

   gcloud run services describe my-app-api --region us-central1
   gcloud logging read "resource.type=cloud_run_revision" --limit=20
   

2. Review Cloud Logging for application errors.
3. Fix the configuration or container image.
4. Redeploy:

   gcloud run deploy my-app-api --image gcr.io/$PROJECT_ID/my-app:latest --region us-central1
   

Common failure causes:

• IAM permission errors -- verify service account roles and --allow-unauthenticated flag
• Quota exceeded -- request quota increase via IAM & Admin > Quotas
• Container startup failure -- check container logs and health check configuration
• Region not enabled -- enable the required APIs with gcloud services enable

---

Tools

architecture_designer.py

Recommends GCP services based on workload requirements.

python scripts/architecture_designer.py --input requirements.json --output design.json

Input: JSON with app type, scale, budget, compliance needs Output: Recommended pattern, service stack, cost estimate, pros/cons

cost_optimizer.py

Analyzes GCP resources for cost savings.

python scripts/cost_optimizer.py --resources inventory.json --monthly-spend 5000

Output: Recommendations for:

• Idle resource removal
• Machine type right-sizing
• Committed use discounts
• Storage class transitions
• Network egress optimization

deployment_manager.py

Generates gcloud CLI deployment scripts and Terraform configurations.

python scripts/deployment_manager.py --app-name my-app --pattern serverless_web --region us-central1

Output: Production-ready deployment scripts with:

• Cloud Run or GKE deployment
• Firestore or Cloud SQL setup
• Identity Platform configuration
• IAM roles with least privilege
• Cloud Monitoring and Logging

---

Quick Start

Web App on Cloud Run (< $100/month)

Ask: "Design a serverless web backend for a mobile app with 1000 users"

Result:
- Cloud Run for API (auto-scaling, no cold start with min instances)
- Firestore for data (pay-per-operation)
- Identity Platform for authentication
- Cloud Storage + Cloud CDN for static assets
- Estimated: $15-40/month

Microservices on GKE ($500-2000/month)

Ask: "Design a scalable architecture for a SaaS platform with 50k users"

Result:
- GKE Autopilot for containerized workloads
- Cloud SQL (PostgreSQL) with read replicas
- Memorystore (Redis) for session caching
- Cloud CDN for global delivery
- Cloud Build for CI/CD
- Multi-zone deployment

Serverless Data Pipeline

Ask: "Design a real-time analytics pipeline for event data"

Result:
- Pub/Sub for event ingestion
- Dataflow (Apache Beam) for stream processing
- BigQuery for analytics and warehousing
- Looker for dashboards
- Cloud Functions for lightweight transforms

ML Platform

Ask: "Design a machine learning platform for model training and serving"

Result:
- Vertex AI for training and prediction
- Cloud Storage for datasets and model artifacts
- BigQuery for feature store
- Cloud Functions for preprocessing triggers
- Cloud Monitoring for model drift detection

---

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 GCP limit	$500/month max
Team context	Size, GCP experience	3 devs, intermediate
Compliance	Regulatory needs	HIPAA, GDPR, SOC 2
Availability	Uptime requirements	99.9% SLA, 1hr RPO

JSON Format:

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

---

Output Formats

Architecture Design

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

IaC Templates

• Terraform HCL: Production-ready Google provider configs
• gcloud CLI: Scripted deployment commands
• Cloud Build YAML: CI/CD pipeline definitions

Cost Analysis

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

---

Anti-Patterns

Anti-Pattern	Why It Fails	Better Approach
Using default VPC for production	No isolation, shared firewall rules	Create custom VPC with private subnets
Over-provisioning GKE node pools	Wasted cost on idle capacity	Use GKE Autopilot or cluster autoscaler
Storing secrets in environment variables	Visible in Cloud Console, logs	Use Secret Manager with Workload Identity
Ignoring sustained use discounts	Missing 20-30% automatic savings	Right-size VMs for consistent baseline usage
Single-region deployment for SaaS	One region outage = full downtime	Multi-region with Cloud Load Balancing
BigQuery on-demand for heavy workloads	Unpredictable costs at scale	Use BigQuery slots (flat-rate) for consistent workloads
Running Cloud Functions for long tasks	9-minute timeout, cold starts	Use Cloud Run for tasks > 60 seconds

---

Cross-References

Skill	Relationship
engineering-team/aws-solution-architect	AWS equivalent — same 6-step workflow, different services
engineering-team/azure-cloud-architect	Azure 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 GCP
engineering/ci-cd-pipeline-builder	Pipeline construction — automates Cloud Build and deployment

---

Reference Documentation

Document	Contents
references/architecture_patterns.md	6 patterns: serverless, GKE microservices, three-tier, data pipeline, ML platform, multi-region
references/service_selection.md	Decision matrices for compute, database, storage, messaging
references/best_practices.md	Naming, labels, IAM, networking, monitoring, disaster recovery