A point-of-sale platform built as a multi-tenant SaaS: organisations, branches and users on one schema, a till that keeps up with a USB scanner, and a versioned public API with scoped keys.
This is a full-stack system rather than a till with a database behind it. Tenancy runs organisation, branch, user and membership; prices live in lists rather than a single field so wholesale and retail can differ per branch; and every price change, cost change, sale and cancellation writes to an append-only audit log. Payments go through Mercado Pago with webhook reconciliation, background work runs on a Redis-backed queue, and the floor screens stay in sync over websockets.
The operations system a school actually runs on — students, teachers, classes, fees, reports — put online and then hardened: scheduled jobs, backups, an audit log and a documented way to update it.
A multi-tenant restaurant platform: an installable POS on the floor, a kitchen display that updates as orders change, and a NestJS backend holding the order state machine behind both.
A private web application for running a savings fund — weekly contributions, internal loans, referrals, profit shares and cycle close. It records and calculates; it moves no money.
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