Case Study: Tatako — Digital Loyalty & Stamp Card Platform
Tatako is a two-sided digital loyalty platform that replaces paper punch cards with QR-based stamps, a mobile customer wallet, and a merchant dashboard built for real counter-side speed. Merchants create digital stamp programs, staff scan customer QR codes to award stamps at the counter, and customers track their rewards in a PWA wallet on their phone.
The Problem with Paper Punch Cards
Small businesses — cafés, salons, restaurants, retail shops — still rely on physical punch cards for loyalty programs. Cards get lost. Staff miscount stamps. Merchants have no visibility into which programs are working, who's close to earning a reward, or how repeat visits are trending. Tatako replaces this with a digital system that works at counter-side speed without requiring customers to download an app from the App Store.
What We Built
PASDEV built Tatako as a production-ready, two-sided SaaS product with separate flows for merchants and customers. Merchants create and manage stamp card programs from a dashboard, track customer progress, and handle redemptions. Customers join via QR scan, collect stamps on digital cards, and redeem rewards from their phone wallet. Convex powers real-time loyalty state — stamp counts and redemptions are live across all sessions without polling or page refreshes.
Key Features
- Merchant dashboard — build stamp card programs, set rewards, track customer visits and analytics
- Counter-side stamping — staff scan customer QR codes in seconds, no app store required
- Digital customer wallet — enrollment via QR, stamps collected per program, reward redemption flow
- Real-time loyalty state via Convex — stamp counts stay in sync instantly across all sessions
- Role-based routing and permissions — separate merchant, customer, and admin experiences
- Installable PWA — works from phone home screen without going through App Store or Google Play
- Subscription tiers and analytics for merchants managing multiple locations or programs
Tech Stack
Next.js · React · TypeScript · Tailwind CSS · Convex (real-time backend) · Firebase (auth) · Zustand · Recharts · Radix UI · Framer Motion · PWA · Vercel
Live at: tatak.pasdev.co
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