Full Stack

Mobile

Frontend

FinTech / Web3

2022

Real-Time Crypto Trading App

A real-time, mobile-first crypto trading experience with live data and Web3 wallets.

React.jsRedux ToolkitWebSocketsReact NativeWeb3MetaMask

+25%

Engagement

Real-time

Data latency

Web + Mobile

Platforms

Overview

A trading application delivering live market data, order flows, and Web3 wallet integration across web and mobile.

The business problem

Traders needed low-latency price updates and a smooth mobile experience, plus secure on-chain wallet connections.

The solution

I built a real-time data layer over WebSockets, a responsive React Native UI, and integrated MetaMask and WalletConnect for on-chain interactions.

Architecture

WebSocket streaming layer for live prices and order books.
Redux Toolkit store with normalized market data.
React Native mobile-first UI with shared logic.
Web3 wallet integration (MetaMask, WalletConnect).

Engineering decisions

WebSockets over polling for true real-time data.
Normalized state to keep updates cheap.
Mobile-first design for the primary audience.

Performance optimizations

Throttled/batched updates to avoid render storms.
Selective subscriptions to limit payloads.
Memoized chart components.

Challenges

Sustaining smooth UI under high-frequency price updates.
Reliable Web3 wallet connection and signing flows.
Consistent UX across web and mobile.

Lessons learned

Real-time UX lives or dies on update batching.
Web3 flows need forgiving, well-signposted UX.