Most businesses do not need a new product. They need the thing they already do, done in one system instead of four, by people who are not in the office.
We build those systems end to end: the data model, the interface, the mobile client if there is one, and the migration that gets years of existing records across without losing a line. We work in TypeScript on the server and in the browser, with a relational database and a typed schema shared between every client, so the web app, the API and the phone all agree on what an invoice is.
Where a system replaces something that already exists, the migration is written as code and verified by reconciliation: row counts and money totals compared between old and new, with the import failing loudly if they disagree.
