Secure Payment Tracker

QAST's finance team was tracking client payments in Excel spreadsheets. As the number of clients grew, keeping track of which payments were at which stage — purchase order issued, invoice sent, partially paid, fully paid — became error-prone and hard to audit.

The team needed a clear, shared view of every payment's lifecycle so nothing slipped through the cracks.

Designed the payment stage model — mapping out each state in the lifecycle and the valid transitions between them — then built the backend API in NestJS with PostgreSQL to persist and enforce those states.

Built the front-end dashboard in Next.js so the team could view, filter, and update payment records in one place. Deployed the full stack on OCI.