How to deploy SaaS in a customer VPC: implementation approaches and tradeoffs

Deploying SaaS in a customer's VPC involves either running vendor-operated components directly inside the customer's cloud environment or exposing vendor services privately within the customer's network. On AWS, this can be achieved through approaches like AWS PrivateLink, in-VPC or BYOC deployments, and AWS VPC Lattice, each addressing different needs regarding data isolation, network connectivity, and operational complexity. The choice of method depends on factors like compliance, security policy, and infrastructure requirements. While AWS PrivateLink offers private connectivity without exposing data to the public internet, data processing remains in the vendor's environment. In-VPC deployments handle data processing within the customer's environment, meeting stricter compliance needs. AWS VPC Lattice facilitates service connections across multiple VPCs with fine-grained access control. Deploying across multiple customer environments requires significant engineering investment in infrastructure automation, using tools like Kubernetes, Terraform, and GitOps pipelines to maintain consistency and scalability. Solutions like Northflank offer a control plane to manage application deployments across various cloud environments, reducing the need for vendors to build custom infrastructure. Understanding the customer's specific requirements is crucial to selecting the appropriate deployment model.