Migrating Off a Managed Platform to a Hyperscaler: 9 Automation Tools Compared and a Cutover Playbook for Under 10 Minutes of Downtime

Migrating a complex microservices application from a managed platform such as Heroku, Render, or Fly.io to AWS, GCP, Azure, Scaleway, or a self-managed Kubernetes environment requires separate planning for infrastructure provisioning, application delivery, data migration, and replacement of platform features such as add-ons, schedulers, log drains, configuration management, and preview environments. Infrastructure tools including OpenTofu, Terraform, Pulumi, and Crossplane create cloud resources but do not replace developer workflows, while Argo CD and Flux support Kubernetes GitOps for teams with existing platform expertise; internal developer platforms such as Qovery, DuploCloud, and LocalOps aim to combine provisioning and deployment workflows in a customer-owned cloud account. The central technical risk is database cutover rather than application deployment, with streaming PostgreSQL logical replication or cloud migration services enabling a short write freeze and typically less than 10 minutes of downtime, whereas dump-and-restore approaches can create outages lasting hours. Successful cutovers also require advancing database sequences, validating data and extensions, lowering DNS TTLs well in advance, shifting traffic gradually using weighted routing, testing graceful shutdown behavior, and retaining the original environment for rollback. The cited migration timelines range from roughly 6 to 12 weeks when using a platform that manages provisioning and delivery to 4 to 9 months for teams building infrastructure and GitOps capabilities themselves, with developer-experience preservation and early inventory of hidden dependencies identified as major determinants of success.

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