Divz is a modern, cross-platform expense-splitting application designed to simplify shared finances among friends, roommates, and groups. Built from the ground up to work seamlessly on iOS, Android, and Web from a single codebase.

Users needed a way to:

Track shared expenses across multiple groups (roommates, trips, dinners)

Split bills fairly with flexible splitting options

Settle debts instantly without switching between apps

Access their finances on any device with real-time synchronization

Receive instant notifications when charged or paid

Existing solutions were either too complex, platform-specific, or charged high fees for basic features.

Project Management, Design, Development, and Brand Identity Responsible for:

Architecture design and technical decisions

Frontend development (React Native/Expo)

Backend development (Firebase Cloud Functions, Node.js)

Payment integration (Stripe Connect)

UI/UX implementation

Database schema design

Real-time synchronization logic

Push notification system

Email notification integration

Frontend Architecture React Native + Expo for true cross-platform development Single codebase serving iOS, Android, and Web Responsive design adapting from mobile to desktop glass morphism UI with dark/light theme support. Animated components for smooth, modern interactions Backend Infrastructure Firebase Firestore for real-time database with offline support Firebase Authentication for secure user management Firebase Cloud Functions for serverless backend logic Stripe Connect for payment processing and payouts.

✅ Group creation and management

✅ Expense tracking with categories

✅ Flexible bill splitting (equal, percentage, custom)

✅ Individual (1-on-1) expense splitting

✅ Real-time balance calculations

✅ Settlement via card or wallet balance

✅ Transaction history with search Payment Features

✅ Stripe Connect integration

✅ Instant payouts to bank accounts

✅ In-app wallet with withdrawals

✅ Fee-free wallet-to-wallet transfers User Experience

✅ Dark/Light theme

✅ Push notifications

✅ Email notifications

✅ Responsive web + native mobile

✅ Activity feed with real-time updates Admin Features

✅ User management dashboard

✅ Site-wide maintenance mode

✅ Coming soon page with admin bypass

✅ Email testing tools

✅ Activity monitoring

Stripe Integration on React Native Web

Problem: Stripe's React Native SDK doesn't support web platforms

Solution: Created platform-specific wrapper components (.js and .web.js) that use native SDK on mobile and Stripe.js on web, maintaining a unified API

Real-Time Data Consistency

Problem: Balances needed to update instantly across all screens when expenses or settlements occur

Solution: Implemented Firestore onSnapshot subscriptions at the context level, with useMemo calculations that automatically recompute when underlying data changes

Complex Balance Calculations

Problem: Users needed to see net balances factoring in group expenses, individual splits, and settlements

Solution: Created a unified calculation engine that aggregates: Group expenses (who paid, who owes) Quick splits (individual transactions) Settlements (payments made) Pending vs. completed transactions

Offline Support Problem: Users needed the app to work without internet connection

Solution: Leveraged Firestore's built-in offline persistence, with optimistic UI updates and automatic sync when connection restores