Executive Summary

A private investment bank needed to adopt cloud infrastructure while maintaining strict compliance and governance requirements. Banking regulations demand complete traceability, security controls from day one, and the ability to demonstrate compliance at any moment.

We designed and implemented their entire Azure infrastructure using the Azure Landing Zone framework, with everything defined in Terraform and deployed through CI/CD pipelines. No manual changes are possible - every change is tracked, reviewed, and auditable.

The Challenge

Banking Context

Investment banks operate under strict regulatory oversight. Every infrastructure change must be documented, approved, and traceable. Manual deployments create compliance gaps and audit risks.

Requirements

  • No existing cloud presence - Starting from zero with no cloud expertise in-house
  • Strict compliance requirements - Need to demonstrate control over all changes
  • Security from day one - Cannot "add security later" - must be built-in
  • Full auditability - Every change must be traceable to a person and approval
  • Repeatable environments - Dev, staging, production must be consistent
  • No manual deployments - Eliminate human error and shadow changes

Our Solution

Azure Landing Zone Framework

We implemented Microsoft's Azure Landing Zone architecture, providing a well-architected foundation with built-in governance, security, and compliance controls.

Landing Zone Architecture

Management Group Hierarchy Azure Policy, RBAC
Platform Landing Zone Identity, Management, Connectivity
Application Landing Zones Workload Subscriptions
Infrastructure as Code Terraform + GitLab CI/CD

1. Management Group Structure

Organized Azure subscriptions into a hierarchical structure enabling policy inheritance and consistent governance:

  • Root management group with baseline policies
  • Platform subscriptions (Identity, Management, Connectivity)
  • Application landing zones by environment and workload type
  • Sandbox subscriptions for controlled experimentation

2. Infrastructure as Code (Terraform)

Every piece of infrastructure defined in Terraform modules:

  • Reusable modules for common patterns (networking, compute, storage)
  • Environment-specific configurations via variables
  • Remote state management with state locking
  • Module versioning for controlled rollouts

3. CI/CD Pipeline Implementation

GitLab CI/CD pipelines enforce the deployment process:

  • Pull request triggers automatic plan and validation
  • Required approvals before apply to production
  • Automated security scanning (Checkov, tfsec)
  • Drift detection and alerting

4. Policy as Code

Azure Policies enforcing compliance requirements:

  • Require encryption at rest for all storage
  • Enforce network security group associations
  • Restrict public IP creation
  • Mandate diagnostic settings and logging
  • Tag enforcement for cost allocation

Results

Capability Achievement
Manual deployments 0% - Everything via pipelines
Compliance coverage 100% policy-as-code
Infrastructure drift Eliminated (Terraform state)
Audit readiness Full deployment history
Security controls Built-in from day one
New environment provisioning Hours (not weeks)
Environment consistency 100% identical (IaC)

"We can now demonstrate to auditors exactly who changed what, when, and why. Every infrastructure change has a paper trail going back to a pull request and approval."

- Head of IT Infrastructure

Key Takeaways

  • Azure Landing Zone accelerates compliance - Built-in governance structure addresses many regulatory requirements out of the box
  • IaC eliminates configuration drift - Terraform state ensures infrastructure matches code exactly
  • Pipelines enforce process - Cannot bypass approvals or skip security checks
  • Policy as Code scales governance - Compliance rules apply automatically to all resources
  • Starting right saves time - Building governance from day one is easier than retrofitting