Mobile App Engineer — Real-Time Trading & Charts

Fullstack; New York, Northern (NY, KY); Hybrid; USD 120,000 - 180,000; Full time

Job summary

Fullstack in New York is seeking a mobile engineer to build the next generation trading app for finance. You will ship features for live market data, multi-venue execution, and real-time performance on iOS.

Collaborate across design, backend, and product, own modules from data handling to wallet integration, and ensure robust UX under volatility. You must be authorized to work in the United States.

Qualifications

• Production iOS experience with Swift in fintech or real-time data environments.
• Strong UI/UX sense and ability to wireframe and prototype.
• Experience shipping apps through the App Store and supporting full release cycles.
• Understanding of iOS performance, memory management, and background tasks.
• Experience with real-time data streams, WebSocket connections, and reconnection logic.

Responsibilities

• Build and maintain iOS features that stay responsive during market volatility.
• Develop a gesture-driven trading interface with information density for power users.
• Create high-performance charts and real-time data visualizations.
• Integrate with mobile wallets and on-device secure key management.
• Architect client-side state with REST APIs and WebSocket streams.
• Configure CI/CD pipelines for automated builds, previews, testing, and rollbacks.

Skills

iOS Development

Swift

Real-Time

UI/UX

WebSocket

Architecture

Ownership

Job description

Fullstack in New York is seeking a mobile engineer to build the next generation trading app for finance. You will ship features for live market data, multi-venue execution, and real-time performance on iOS.

Collaborate across design, backend, and product, own modules from data handling to wallet integration, and ensure robust UX under volatility. You must be authorized to work in the United States.