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Digital Wallet & UPI Payment App

Our client, a fintech startup, needed a digital wallet app that could handle UPI-based payments, peer-to-peer transfers, and recurring bill payments securely and reliably.

The primary challenge was building a payment system that met banking-grade security requirements while keeping transactions fast and the experience simple for everyday users.

Handling failed transactions, reconciliation, and fraud checks in real time added significant complexity beyond a typical consumer app.

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FinTech Secure Payments Native App

Digital Wallet & UPI Payment App

A secure digital wallet app supporting UPI payments, peer-to-peer transfers, and bill payments with bank-grade encryption.

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Faster

Transaction processing

Secure

End-to-end encryption

Real-Time

Balance & transfer updates

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  Project Overview

Project Overview

A secure mobile wallet built to handle UPI payments, transfers, and bill payments at scale.

Challenge

Our client, a fintech startup, needed a digital wallet app that could handle UPI-based payments, peer-to-peer transfers, and recurring bill payments securely and reliably.

The primary challenge was building a payment system that met banking-grade security requirements while keeping transactions fast and the experience simple for everyday users.

Handling failed transactions, reconciliation, and fraud checks in real time added significant complexity beyond a typical consumer app.

Meeting strict security and compliance requirements for payment data
Handling failed or delayed transactions gracefully
Preventing fraud without slowing down legitimate transactions
Ensuring uptime and consistency during high transaction volume
Reconciling balances across wallet, bank, and UPI rails
Keeping the payment flow simple despite the underlying complexity

Key Challenges

Inability to provide real-time service provider tracking and updates
Lack of a centralized platform for managing bookings and workflows
Inefficient scheduling and dispatching of service professionals
Limited payment integration and transaction security
Poor user experience due to lack of intuitive mobile interfaces
Scalability challenges with increasing user and provider demand

Technology Stack

Kotlin

Native Android app for performance and secure local storage.

Node.js

Backend services handling transactions and wallet logic.

PostgreSQL

Transactional database for balances, transfers, and history.

AWS Cloud

Infrastructure sized for secure, high-availability payment processing.

Redis

In-memory caching for fast balance checks and rate limiting.

UPI API Integration

Connects to UPI rails for instant bank-to-bank transfers.

Microservices

Isolates payments, wallet, and notifications for reliability.

Encryption & Tokenization

Protects sensitive payment data at rest and in transit.

AWS EC2

Scalable servers for backend transaction processing.

AWS WAF

Web application firewall protecting payment endpoints.

Push Notifications

Real-time alerts for transfers, payments, and low balance.

Fraud Detection Rules

Rule-based checks that flag suspicious transaction patterns.

Solution

Zyber Zing designed and built a secure digital wallet app that lets users send money, pay bills, and make UPI payments from a single interface.

Built natively in Kotlin for Android with a Node.js backend and PostgreSQL database, the app was architected around transactional integrity from day one.

Redis caching keeps balance checks and transfer confirmations fast, while a dedicated fraud-detection layer flags unusual activity before it reaches settlement.

The wallet, payments, and notification services run as separate microservices, so a spike in one area of usage does not put transaction processing at risk elsewhere.

Key Features

Digital Wallet

Store balance and move money between linked accounts.

UPI QR Payments

Scan-to-pay support for in-store and online merchants.

Peer-to-Peer Transfers

Instant transfers between wallet users.

Bill Payments

Schedule and pay recurring bills from the app.

Transaction History

Searchable log of all wallet activity.

Fraud Alerts

Real-time flags on unusual transaction patterns.

Results

Zyber Zing delivered a payment app built to handle real transaction volume securely, without compromising on speed.

Faster

Transaction Speed

Optimized payment flow reduced processing time per transaction.

Secure

Payment Processing

Encryption and tokenization protect sensitive payment data.

Real-Time

Balance Updates

Users see transfers and balance changes instantly.

Reduced

Fraud Exposure

Rule-based checks catch suspicious activity before settlement.

Scalable

Cloud Infrastructure

Architecture supports growing transaction volume reliably.

The wallet gave the client a secure, scalable payments product ready to onboard real users and transaction volume.

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