Point of saleIn pilot

ÇabukPOS

A point-of-sale system for restaurants and markets that keeps selling when the connection drops, prints to local receipt printers and syncs every sale once the line is back.

Scope: Architecture, Full-stack build, Hardware integration
Stack: Next.js, TypeScript, PostgreSQL, Local agent
Product: Private pilot — demo on request

The problem

A till that stops when the internet stops is not a till. Cloud POS products also tend to leak data between tenants the first time a query forgets a filter.

What we built

Offline sale queue with ordered sync and conflict review
Local print agent and LAN hub for kitchen and floor tablets
Weighed-item barcodes, shelf labels, stock counts and returns
Reporting, subscriptions and permissioned read access for partner tools

Engineering notes

Tenant isolation in the database

Every business table runs under forced row-level security in PostgreSQL, so a query without the right tenant context returns nothing instead of someone else’s sales.

Receipt numbers that never skip

Fiscal document numbers are issued under a row lock that waits rather than skips, so concurrent tills cannot burn or duplicate a number.