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Platform Comparison: Ephemeral Builder + Deploy Pattern

Context

We have a Go-based AI agent platform that generates, compiles, and deploys agent binaries. The current architecture on Fly.io uses two distinct capabilities:

1. Ephemeral builder — DispatchBuild spins up a Fly Machine via the Machines API (api.machines.dev), it builds the Go binary, then the machine self-destructs
2. Persistent deploy — The compiled binary runs as a long-lived Fly app with auto_stop_machines/auto_start_machines

This document evaluates Railway, Koyeb, and Northflank as alternative deployment targets.

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Hello world

<?php

    echo "Hello World"

This is a test