Start from real contracts, data, runtime behavior, and post-release support.
about F1REFlY
F1REFlY
A team building backend systems and engineering products.
F1REFlY works across complex backend contracts, operational reliability, and native tools for teams that run real systems every day.
firefly@about:~/principles
team
$ inspect f1refly --focus=contracts,products
✓ backend systems
✓ macOS products
! claims require evidence
✓ support path documented
How we design
Fewer loud promises, more verified boundaries.
Avoid capabilities that cannot be explained, verified, or maintained.
Turn internal tools into products when they solve repeated engineering work.
Products
Tersa + Tunello
F1REFlY runs the Firefly site and ships products when an internal tool clearly solves repeated engineering work.
F1REFlY product
Tersa
A native window for 218 built-in Direct commands and 200 sandbox-safe native Mac App Store commands, multi-step Chains, snippets, previews, and repeatable actions.
Open product ->
F1REFlY product
Tunello
A native menu bar and manager for SSH tunnels, local ports, on-demand routes, gateway stacks, snippets, and diagnostics.
Open product ->
F1REFlY
Want to discuss a system or product?
Email F1REFlY if you need a backend core, cleaner integrations, or a conversation about Tersa or Tunello.