Fly.io

Fly.io is a developer of a platform allowing users to write, test, and run code locally and help those users deploy the code and scale the code. Developers are able to deploy their applications or a Docker Image to Fly.io and use their CLI to launch instances that are most important for the developer's application. The company's platform uses a global network of servers for visitor traffic, to run middleware on requests, route them to back-end applications, and enable website owners to direct visitors to their respective sites.

Fly.io was founded in 2017 by CEO Kurt Mackey, CTO Jérôme Gravel-Niquet, and Michael Dwan, and is headquartered in Chicago. The company has had customers and partners including Supabase, Tailscale, Fanatics, Cars.com, Apollo, Glide, and Glitch.

The Fly.io global application distribution platform runs a user's code in Firecracker microVMs, running a developer's full stack close to users, whether it is for a simple web service or a database-backed opus with supporting services. This includes persistent storage volumes and ready-to-run Postgres. And, through Fly.io, developers' applications can talk privately with each other through the company's internal WireGuard network.

Further, through the Firecrack application, to make it into a microVM, the platform uses Docker images or OCI container images, meaning users can use Docker to build a container image. However, in many cases, if a developer does not have a Docker image, the Fly.io platform can scan the source code and detect which pre-existing buildpacks match the configuration they need, and the platform's remote builder develops the app container image to deploy.