I built Oficinapp end-to-end as a paid freelance contract between November 2023 and February 2024, fully remote. The engagement came through a referral — a friend who owns an oficina needed a POS.

The discovery phase was genuinely one of the most rewarding parts of the project. Multiple client interviews, domain research, and a lot of note-taking helped me understand the real workflow the team was replacing: a patchwork of paper and spreadsheets for customer records, service orders, and inventory.

Oficinapp replaced that workflow with a single interface for customer records, service orders, and inventory, shipping as a Progressive Web App so the team could install it on their phones right on the shop floor.

Under the hood, the data layer is a PostgreSQL database modeled with Prisma, exposed over a fully typed tRPC API and consumed by a Next.js front end. Authentication uses JWT with NextAuth plus a set of custom hooks. CI runs on GitHub Actions with a Jest test suite, and feature branches flow through a Git-flow pattern to keep main always releasable.

The system is still in production today with only rare support touches over the past year — by far my favorite kind of outcome for a one-person engagement.