Cashbac - Instant Lifestyle Rewards & In-Store Payments Platform

Cashbac was a pioneering instant lifestyle rewards and mobile payment application under PT Global Pay Indonesia (SMDV Group), officially launched in April 2018. The platform enabled users to earn and spend instant cashback seamlessly across thousands of offline merchants without requiring upfront top-ups, linking directly to credit cards and digital payment sources.

Originally rolled out with over 200 merchant partners in Jabodetabek, backed by strategic banking partnerships starting with UOB, Cashbac rapidly scaled nationwide to household retail and dining brands like McDonald's, Alfamart, and FamilyMart. At its operational peak, the platform drove over 700,000+ annual active users and 4,000,000+ annual sessions before merging with Desty Menu and evolving into Horego.

🚀 Key Contributions & Engineering Impact

• Seamless In-Store Checkout Pipeline: Engineered low-latency, multi-method payment workflows supporting QR code scanning, dynamic barcode generation, and PayByQR processing at physical point-of-sale (POS) terminals.
• Micro-Location & Beacon Integration: Implemented Bluetooth Low Energy (BLE) beacon detection across partner merchant outlets, triggering contextual geofenced promotions and rewards the moment users entered physical stores.
• Enterprise-Grade Mobile Hardening: Hardened client application binaries against reverse engineering, tamper attacks, and runtime inspection using multi-layered security suites including DexGuard, DexProtector, and SHIELD SDK.
• High-Throughput Analytics Tracking: Structured and scaled comprehensive behavioral analytics event pipelines across Mixpanel and CleverTap to monitor user journeys, cashback redemptions, and real-time conversion funnels.
• Scalability & Peak Traffic Management: Optimized background synchronization and client-side caching to sustain peak promotional campaigns, maintaining zero-interruption transaction reliability across 4M+ annual app sessions.

💻 Tech Stack & Architecture

• Core & Language: Kotlin, Java, Android SDK
• In-Store Proximity & POS Tech: BLE Beacons, Dynamic Barcode, Dynamic QR Code, PayByQR
• Product Analytics & Funnels: CleverTap, Mixpanel, Firebase Analytics
• Attribution & Growth: AppsFlyer
• Security & Anti-Tamper: DexGuard, DexProtector, Shield SDK, SSL Pinning
• Payment & Bank Gateways: Direct Credit Card tokenization, Xendit, Others E-Wallet, Uangku
• CI/CD & Builds: Visual Studio App Center

📌 Project Overview & Metrics

• Peak Scale: 700K+ annual active users and 4M+ annual sessions
• Merchant Ecosystem: Thousands of merchant outlets nationwide (including McDonald's, Alfamart, and FamilyMart)
• Launch Ecosystem: 200+ launch outlets across Jabodetabek (90% F&B coverage)
• Core Engineering Domains: In-store offline-to-online (O2O) payments, BLE beacon proximity, high-security mobile runtime protection, multi-provider analytics
• Corporate Evolution: Merged with Desty Menu and subsequently rebranded into Horego