Mobile App Engineer

Fullstack • New York City, NY

1d

About The Position

As a Mobile Engineer at Fullstack, you will help build a full-featured mobile trading app for the future of finance. The app will support live market data, complex order types, and multi-venue execution, bringing professional trading capabilities to mobile. The role addresses challenges such as synchronizing real-time price feeds, fitting information-dense trading interfaces to mobile screens, and ensuring reliable performance during volatile market conditions.

You will develop iOS features and trading interfaces, create interactive visualizations, integrate mobile wallets and biometric authentication, manage transaction signing and on-device key security, connect REST APIs and WebSocket streams, and maintain client-side cached state. You will also configure and maintain CI/CD pipelines for automated builds, previews, testing, and rollbacks. The role calls for strong ownership of architecture and feature development, design judgment, and collaboration in an in-person engineering environment.

Requirements

• At least 3 years of experience shipping iOS applications in Swift.
• Experience shipping apps through the Apple App Store and understanding the release cycle from provisioning through review and production.
• Deep understanding of iOS performance characteristics, memory management, and background processing.
• Experience building applications that handle live data streams, including WebSocket connection management, reconnection, and responsive user interfaces.
• Strong UI/UX sensibility, including comfort with wireframing, prototyping, design decisions, information hierarchy, and gesture-driven interfaces.
• Comfort making architectural decisions and leading feature development.
• Ability to thrive in high-bandwidth, in-person engineering environments.
• Must be authorized to work in the United States.

Nice To Haves

• Experience in fintech, trading, or real-time data environments.

Responsibilities

• Design iOS features that remain responsive during market volatility and efficiently handle real-time data.
• Build gesture-driven trading interfaces that present information-dense professional trading functionality on mobile screens.
• Develop high-performance interactive charts and real-time visualizations to support trading decisions.
• Build native integrations with mobile wallets and biometric authentication.
• Handle transaction signing and secure on-device key management.
• Integrate REST APIs and WebSocket streams and manage robust client-side cached state.
• Configure and maintain CI/CD pipelines for automated builds, previews, testing, and rollbacks.
• Make architectural decisions and lead feature development.

What This Job Offers

• Job Type: Full-time
• Career Level: Mid Level
• Education Level: No Education Listed