Client projectPWAOffline-firstFullstack
Fair Sales Management System
Caixa da Feira is a practical sales system built for checkout operations during fairs and local events. It replaces manual notes with a fast PWA for products, carts, payments, sales history, reports, CSV export, and manual cloud sync.
Vue 3TypeScriptPiniaVite PWAIndexedDBFirebaseVitest
PROJECT OVERVIEW SUMMARY
Key project indicators
CASE STUDY PROCESS
From context to outcome
CONTEXT — 01
A client needed a simpler way to organize in-person sales at fairs, where products sold, received amounts, and daily results were still tracked manually.
PROBLEM — 02
During an event, checkout needs to be fast and reliable. Manual records increased the risk of mistakes, lost information, and extra work when checking revenue, payment methods, and best-selling products.
MY ROLE — 03
I led the product implementation end to end, translating the in-person sales routine into data models, checkout flows, offline persistence, tests, reports, and controlled cloud synchronization.
SOLUTION — 04
I built an offline-first PWA with authentication, fair/event separation, product management, categorized sales cart, cash/Pix/card checkout, change calculation, sales editing/canceling, reports, CSV export, local IndexedDB storage, and manual Firestore sync.
KEY FEATURES — 05
Product registration, cart, cash/Pix/card checkout, change calculation, sales history, editing and cancellation, reports, CSV export, IndexedDB persistence, and manual Firestore sync.
RESULTS — 06
The client gained a more organized and reliable sales routine, with faster checkout, structured history, clearer revenue reports, and the ability to keep operating even with unstable internet.