Governance at Scale: Managing IAM and Policy Enforcement across AWS and GCP

As enterprises accelerate their multi-cloud strategies, managing Identity and Access Management (IAM) and enforcing governance policies across platforms like AWS and GCP has become a top priority. These cloud providers offer distinct IAM models, policy enforcement tools, and logging mechanisms, creating complexity for organizations seeking consistent security, compliance, and operational control. This article explores a comprehensive governance framework for managing IAM and policy enforcement at scale in a dual-cloud environment. It examines core architectural principles, identity federation strategies, scalable IAM design, and automation practices using infrastructure-as-code and policy-as-code tools. Additionally, it highlights native policy enforcement mechanisms such as AWS Service Control Policies and GCP Organization Constraints, while outlining approaches for centralized monitoring, auditing, and anomaly detection. Through a real-world case study of a financial services platform, the article illustrates how cross-cloud governance can be automated, monitored, and evolved to meet business and regulatory demands. The piece concludes with lessons learned, technical recommendations, and a blueprint for sustainable cloud governance in large-scale environments.