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.
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.
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