Harness implemented a tiered approach to cloud infrastructure, leveraging Infrastructure as Code (IaC) tools such as OpenTofu and Terragrunt, alongside Kubernetes and Helm Charts to manage their cloud-native stack of microservices. This stack is divided into four tiers, each with specific responsibilities ranging from fundamental cloud infrastructure management to microservices deployment, ensuring security and operational efficiency. By employing on-demand Devspaces for development and testing, Harness has significantly enhanced its development processes, allowing numerous independent teams to perform end-to-end feature testing without integration bottlenecks. Git-based version control ensures repeatability and auditability across their infrastructure, while the Environment-as-a-Service model driven by Harness pipelines facilitates the rapid creation of production clusters and development environments. This initiative has successfully reduced the time to deploy new production clusters from weeks to mere hours, and future plans include improving system usability and potentially open-sourcing their infrastructure repository for wider benefit.