ProjectSynergy POS — Cloud-Synced Retail Point of Sale
A hybrid, offline-first point-of-sale system for retail stores. It features ultra-fast checkout, barcode scanning, automated receipt printing, custom discount rules, and automatic data syncing when the internet connection is restored. Powered by an administrative control center for product uploads, multi-store pricing, and sales tax reporting.
Built With
Product Core Features
Key software highlights engineered specifically for this digital system.
Sub-second Checkout
Process sales in seconds with hotkeys, barcode scanning, and quick-pay options.
Offline-first Transactions
Transactions are cached locally when the internet drops, ensuring checkouts never stop.
Smart Multi-Register Sync
Reconciles sales and stock across all checkout counters automatically when online.
Operational Workflow
How this system functions step-by-step to coordinate workflows under the hood.
Scan Barcode
The cashier scans product barcodes. Pricing and active deals are fetched instantly.
Offline Processing
If the network drops, transaction data is safely buffered in local browser storage.
Cloud Sync
Once online, POS queues sync transaction receipts to update the master inventory database.
Development Journey
An inside look at our engineering goals, execution methodologies, and final project outcomes.
Overview & Goal
To design a retail POS that ensures zero downtime for cashiers while keeping inventory accurate across multiple branches and integrating digital wallets.
- Sub-second item search and barcode registration at checkout
- Robust local storage caching to process transactions with zero internet connection
- Centralized store dashboard for managing pricing, taxes, and stock levels across outlets
Execution
We developed a React client utilizing IndexedDB for local offline storage, and synced data back to a Node/Express API with PostgreSQL via transactional batch synchronization.
- Optimistic UI updates to ensure cashiers experience instant response times
- IndexedDB database layer that buffers transactions and reconciles sync conflicts
- NFC and QR code scanner integration for seamless mobile wallet payments
Results
Cashiers could process more checkouts during peak hours. Synchronized data allowed operations managers to coordinate stock replenishment between branches efficiently.
- Increased peak hourly checkouts due to speedier search and scan actions
- Eliminated data discrepancies between storefront sales and backend inventory records
- Automated financial reconciliations, freeing accountants from manual reporting
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