Case Study
Card Bundle: from concept to production mobile wallet.
Card Bundle was delivered as a mobile-first product with clear architecture, production-grade backend APIs, native widget support, multilingual rollout, and supporting web touchpoints.
Project Snapshot
Overview
What We Built
A practical mobile wallet for loyalty and membership cards with fast scan-and-save, barcode-first checkout flow, and reliable cloud sync.
React Native, Expo, Sails.js, PostgreSQL, WidgetKit, Firebase
Delivery Numbers
At a Glance
Execution Path
From Architecture to Release
Foundation
Defined bounded contexts early and established API contracts before UI implementation.
Core Backend
Implemented JWT auth, refresh token flow, and robust card CRUD endpoints with file handling.
Mobile Experience
Shipped scan flow, card management, offline persistence, and usability-focused card preview UX.
Native Integration
Added iOS/Android widgets with shared data sync and deep linking directly into selected cards.
International Rollout
Localized every screen and system message for broad market coverage.
Production Operations
Completed store compliance, integrated analytics/crash monitoring, and deployed stable backend infrastructure.
Technical Scope
Architecture and Stack
Frontend
React Native + Expo with Redux Toolkit and persisted state for resilient mobile behavior.
Backend
Sails.js API on PostgreSQL with JWT authentication, secure file processing, and clean service boundaries.
Native Widgets
iOS WidgetKit and Android widgets synchronized through app-level state update hooks.
Observability
Firebase Analytics and Crashlytics integrated for production monitoring and release feedback loops.
Outcome
Key Outcomes
- Delivered production-ready iOS and Android experiences with consistent card retrieval workflows.
- Reduced checkout friction by prioritizing quick barcode access and lightweight navigation patterns.
- Established a maintainable full-stack foundation for future subscription and feature expansion.