Crypto Trading Platform

A crypto trading platform with high-throughput real-time order books, live candle charting, and secure API signature authentication built on Flutter, Node.js, WebSockets, and REST APIs.

9:41

BTC/USDT +5.24%

$94,820.50

Depth BookWS: 60 FPS

Project Overview

Traders need market data that does not stall the UI. The platform streams order-book and candle updates over WebSockets, keeps REST for authenticated trading actions, and isolates exchange signature authentication from presentation code.

My Engineering Role

Senior Flutter developer for real-time trading UI, WebSocket integration, charting, biometric access, and Node.js API contracts delivered with ROXO.

The Challenge

High-frequency market data can overwhelm a mobile UI, while trading actions require cryptographic request signing that must never leak into widget code.

The Solution

A Flutter trading client consumes throttled WebSocket streams through a repository layer, renders live candles and order books, and signs REST orders through a dedicated auth adapter.

High-Level Architecture

WebSockets deliver market data independently from authenticated REST trading calls.
A Flutter domain layer throttles and normalizes order-book and candle updates.
API signature authentication lives behind a secure client adapter, not in screens.

Key Features & Workflows

Real-time order books
Live candle charts
Authenticated order placement
Biometric app access
Wallet and market views

Technical Challenges Overcome

Rendering dense tick updates without dropping frames
Recovering WebSocket sessions without duplicating orders
Keeping HMAC/signature secrets out of the UI layer

Production Results & Impact

A trading interface that stays usable under high-frequency market updates.
Clear separation between streaming market data and signed trading actions.
Production fintech delivery as part of the ROXO engagement.

Related Engineering Notes

Real-Time Systemsflutter.dev/architecture

WebSocket Tick Engine60 FPS

Production VerifiedClean Architecture

Real-Time Systems 12 min read

Building 60 FPS Real-Time Financial & Crypto Dashboards with WebSockets in Flutter

Handling thousands of price updates per second without freezing the UI thread requires strict event throttling and isolate processing.

Read Article Architecture Note

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