This post demonstrates how to set up a remote in-browser IDE configured for Elixir/Phoenix development using Fly Machines, VMs managed directly by users. The author guides readers through configuring and deploying an Elixir/Phoenix development environment on a Fly.io Machine, creating an app with storage volume and IP address, setting secrets, and starting the new VM. They also show how to log into the remote dev environment and deploy a hello-world Elixir/Phoenix app. The steps involve using Dockerfile, code-server IDE, flyctl CLI tool, and Fly.io platform for VMs management.