Frontend & Backend

Frontend: Next.js with Tailwind CSS and Progressive Web App (PWA) Capabilities

The frontend is built using Next.js, a React-based framework renowned for its server-side rendering (SSR) and static site generation (SSG) features, which enable lightning-fast load times and superior SEO. This choice is ideal for Finu because it supports real-time data updates without full page reloads, crucial for dynamic elements like live expense tracking and AI chat interfaces.

Tailwind CSS complements this by providing utility-first styling, allowing rapid development of responsive, mobile-optimized designs that adapt seamlessly across devices. As a PWA, Finu offers offline capabilities, push notifications, and installable app-like experiences on iOS and Android, reducing user friction and boosting engagement - key for retaining digital-native users who expect instant access.

Compared to alternatives like vanilla React, Next.js's hybrid rendering reduces latency by up to 50%, making it the best option for a performance-critical app handling sensitive financial data.

Backend: Node.js with Redis Caching and MongoDB for Data Storage

Node.js serves as the backend runtime, chosen for its non-blocking I/O and event-driven architecture, which excels in handling high-concurrency tasks such as real-time AI queries and transaction logging. This scalability is essential for Finu, as user growth could spike with viral Web3 rewards, and Node.js can manage thousands of simultaneous connections efficiently without excessive resource consumption.

Redis is integrated for caching, storing frequently accessed data like user sessions and token balances in memory for sub-millisecond response times - critical for features like instant streak updates or dashboard refreshes. For persistent storage, MongoDB is employed as the primary database for financial data, offering schema flexibility to accommodate varied user profiles, transaction histories, and goal metadata.

Unlike rigid relational databases like PostgreSQL, MongoDB's document-oriented model allows seamless scaling horizontally, supporting sharding for millions of records as Finu expands globally. This stack ensures 99.9% uptime and handles peak loads, positioning Finu ahead of competitors using slower monolithic backends.