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.
The most important decision in this system is what it deliberately does not do: it processes no payments, deposits or withdrawals. Cash is handled outside it, and the application's job is to record, calculate, audit and show. Money is held in decimal arithmetic rather than floating point, sessions are signed tokens, and the financial and privacy rules are covered by a verification suite rather than by trust.
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 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.
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