Wallet
A double-entry ledger that reads bank notifications and credits a matching transfer in half a second, with no human in the loop.
Inward
A study app that works fully offline, with no account. Sign in and every device merges cleanly, even after days apart.
- Server
- ASP.NET Core on .NET 10, PostgreSQL
- Sync
- Multi-device merge with ULIDs, tombstones and a hybrid logical clock
- Clients
- Vue 3 PWA and Android, built and run end to end
Try to take it down.
A live model of the failure handling behind our production services.
0Delivered
0Requests lost
0Charged for failures
0.0sPaid wait now
Requests are flowing. Blue dots are paid users, black are free.
A simulation of the production design, shown at half speed. Numbers are counted here, not taken from production.
Control plane
One command adds a server. Config is validated, swapped and health-checked, and rolls back by itself.
Message pipeline
One codebase for five messengers, where each platform is a single adapter. In production for a client.
Have a backend to build?
hi@calogue.comBased in Tehran, Iran. Open to contract work with European and UK teams.