What tech stack does Fly.io use?
Fly.io's stack is detected from public docs, job postings, product docs, and stack pages. It is directional and should not be treated as a private architecture map.
- Frontend
- Public signal limited
- Backend
- Go
- Cloud
- Public signal limited
- Data
- Postgres
- Critical path
- Fly Machines
- GTM
- Enterprise / PLG
Fly.io detected technology stack
Detected technologies for Fly.io come from public evidence and are grouped by layer.
- Firecracker· Compute
- Rust· Infrastructure
- Go· Backend
- Elixir/Phoenix· Product
- WireGuard· Network
- Docker images· Deployment
- Postgres· Data
- CUDA / NVIDIA GPUs· AI infrastructure
What does Fly.io use on the backend and infrastructure?
Backend and infrastructure signals include Firecracker, Rust, Go, WireGuard, Postgres. These are public directional signals, not a complete internal inventory.
What does Fly.io use on the frontend, data, or GTM tooling?
Frontend, data, and GTM signals include Elixir/Phoenix, Postgres.
What Fly.io's stack means if you sell to them
Vendors should map integrations to the detected stack and avoid displacement claims without confirmed incumbent usage. The strongest pitch is one that improves edge cloud infrastructure reliability, analytics, security, or buyer workflow.
As of June 2026.Sources:Fly.io stack/business sourceFly.io jobs/docs source
Fly.io — frequently asked questions
