Prefect is a flexible tool to orchestrate the modern data stack. In contrast to many other solutions on the market, it doesn't tie you to any specific execution framework or cloud provider — whether you want to use Kubernetes on GCP, AWS ECS, a bare-metal server, or an on-demand distributed Dask cluster such as Coiled, Prefect got you covered. As with any flexible platform, there are some things you need to configure to let Prefect know where your data workflows should run. In this article, we'll look at how to leverage spot instances on AWS ECS Fargate as your cost-effective execution layer.