Payment Dashboard App

Overview

Payment Dashboard App is a robust mobile solution designed to simplify financial tracking for businesses and individuals. Built with a focus on security and real-time data availability, it provides users with instant insights into their transaction history and financial health through an intuitive, mobile-optimized interface.

What Users Can Do

• Visualize Finance: Monitor income and expenses with interactive charts and graphs using React Native Chart Kit.
• Track Real-Time: Receive instant updates on new transactions via WebSocket connections, ensuring data is always current.
• Manage Transactions: Seamlessly add new payments, view detailed transaction histories, and filter records.
• Secure Access: Log in securely using JWT-based authentication with encrypted token storage on the device.
• Role Management: Access features based on user roles (Admin vs. Viewer), ensuring data integrity and security.
• User Administration: Admins can manage user accounts and permissions directly from the app.

Tech Stack

• Frontend: React Native (Expo), TypeScript, React Navigation
• Backend: NestJS, specific modules for Auth, Payments, and Users
• Database: PostgreSQL with Prisma ORM data modeling
• Real-time Engine: Socket.io with NestJS Gateways for live event emission
• Security: Passport.js strategies, Bcrypt hashing, and Expo Secure Store

Architecture & Challenges

• Real-time Synchronization: One of the core challenges was ensuring the dashboard updates instantly when a payment is processed. This was solved by implementing a custom WebSocket Gateway in NestJS (payments.gateway.ts) that broadcasts events to connected clients, triggering immediate UI refreshes.
• Secure Authentication: Managing persistent login sessions securely on a mobile device required integrating Expo Secure Store to handle JWT tokens safely, preventing unauthorized access while maintaining a smooth user experience.
• Data Visualization: Integrating complex financial charts within a mobile view required careful configuration of react-native-chart-kit to ensure responsiveness and readability across different device sizes.

Future Plans

• Push Notifications: Implement native push notifications for critical payment alerts even when the app is in the background.
• Advanced Export: enhance reporting capabilities with PDF and Excel export options for detailed financial analysis.
• Multi-Currency Support: Add dynamic currency conversion for international transaction handling.