Digital Wallet Application

Overview

Architected and developed a secure digital wallet platform enabling users to on-ramp funds from bank accounts and perform real-time peer-to-peer wallet transactions.

Key Highlights

• Designed and implemented a dedicated Node.js (Express.js) HTTP server to process bank webhook events for fund transfers, ensuring reliable updates to wallet balances.
• Utilized transactional row-level locking in PostgreSQL (via Prisma ORM) to ensure data integrity and prevent race conditions during concurrent balance updates.
• Engineered the front end with Next.js, TypeScript, and TailwindCSS, delivering a responsive and intuitive user interface for seamless wallet management.
• Employed a monorepo architecture (Turborepo) to streamline development workflows and improve modularity between front-end and back-end services.

Tech Stack

• Frontend: Next.js, TypeScript, TailwindCSS
• Backend: Node.js, Express.js
• Database: PostgreSQL (Prisma ORM)
• Architecture: Monorepo (Turborepo)

System Design