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Fullstack

Mobile App Engineer

Posted One Month Ago
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In-Office
New York City, NY, USA
185K-300K Annually
Mid level
In-Office
New York City, NY, USA
185K-300K Annually
Mid level
Build and ship a production iOS trading application with live market data, complex order types, multi-venue execution, interactive charts, wallet integrations, biometric authentication, and secure on-device key management. Develop gesture-driven interfaces, integrate REST APIs and WebSocket streams, manage cached client state, and maintain CI/CD pipelines. The role requires strong iOS performance expertise, App Store release experience, real-time systems knowledge, UI/UX judgment, and architectural ownership.
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The Role

As a Mobile Engineer at Fullstack, you will be part of building the next generation mobile trading app for the future of finance. This is a full featured trading experience, not a simplified pocket app. Features include live market data, complex order types, and multi venue execution on mobile. You will tackle challenges like maintaining synchronized real time price feeds, bringing the power of professional trading terminals to a mobile form factor, and building systems that perform under highly volatile market conditions.

What You’ll Build & Solve

iOS App Development: Design features that stay responsive during market volatility and handle real-time data efficiently.

Trading Interface: Build gesture driven mobile UI that delivers the information density of professional trading terminals without overwhelming small screens, while preserving full functionality for power users.

Data Visualization: Develop high-performance, interactive charts and real-time visualizations that help users make informed trading decisions.

Wallet Integration: Build native integrations with mobile wallets and biometric authentication. Handle transaction signing and secure key management on-device.

System Architecture: Integrate complex REST APIs and WebSocket streams while managing robust client-side cached state.

DevOps & Quality: Configure and maintain CI/CD pipelines for automated builds, previews, testing, and seamless rollbacks.

What You Bring

Production iOS Experience: 3+ years shipping iOS applications in Swift, ideally in fintech, trading, or real-time data environments.

Design Sensibility: Strong eye for UI/UX. Comfortable wireframing, prototyping, and making design decisions. Understand information hierarchy and gesture-driven interfaces.

App Store Experience: Shipped apps through the Apple App Store. Understand the full release cycle from provisioning to review to production.

Platform Knowledge: Deep understanding of iOS performance characteristics, memory management, and background processing.

Real-Time Systems: Experience building apps that handle live data streams. Know how to manage WebSocket connections, handle reconnection, and keep UI responsive.

Ownership Mindset: Comfortable making architectural decisions and leading feature development.

In-Person Collaborator: Thrive in high-bandwidth, in-person engineering environments.

Work Authorization: Must be authorized to work in the United States.

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