Cashbac Biz - Dedicated Merchant Management & Payment Platform

Cashbac Biz was the official merchant-side operations and payment acceptance platform by Cashbac, engineered to equip business owners across F&B, retail, and lifestyle sectors with low-latency transaction processing and actionable operational visibility. The platform streamlined digital in-store checkouts while empowering merchants to manage branch operations and deploy localized customer reward campaigns.

🚀 Key Contributions & Engineering Impact

Real-Time Web Verification PWA: Architected and deployed the lightweight JavaScript-based Progressive Web App (PWA) utilized across thousands of retail and dining outlets for instant, reliable payment verification at the counter.
Hardware-Free Beacon Proximity Engine: Engineered a native Bluetooth Low Energy (BLE) proximity payment architecture capable of transmitting beacon signals directly from the merchant's Android device. This software-driven innovation eliminated costly imported physical beacon hardware, driving rapid, friction-free adoption across the merchant network.
High-Impact Critical Bug Resolution: Proactively diagnosed and permanently resolved a critical payment verification failure outside primary role boundaries, where transactions became trapped in an indefinite "pending" state on the merchant PWA. The low-level fix maintained 100% transaction integrity across thousands of physical locations until the platform's lifecycle concluded.
Multi-Branch & Terminal Architecture: Designed operational workflows supporting multi-branch hierarchy, staff role delegation, and cashier-level transaction tracking to maintain financial accountability across high-volume merchant chains.

💻 Tech Stack & Architecture

Client & Web Engine: JavaScript, Progressive Web App (PWA), Native Android SDK
Proximity & In-Store Tech: BLE Beacon Emulation (Direct Device-to-Device), Dynamic QR Code & Barcode Scanners
Real-Time Communication: WebSockets / Event-driven state updates for instant checkout verification
Security & Integrity: SSL Pinning, Tokenized Session Handling, Role-Based Access Control (RBAC)

📌 Project Overview & Metrics

Footprint: Deployed across thousands of physical merchant counters nationwide
Hardware Innovation: 100% software-emulated beacon transmission, eliminating dedicated external POS hardware costs
Stability: Zero transaction-locking regressions following the PWA state synchronization fix
Core Engineering Domains: PWA development, Bluetooth Low Energy (BLE) peripheral mode, real-time transaction verification, POS optimization