Mobile App Engineer

FullStack Labs

$120K — $145K *
Finance & Insurance
Less than 5 years of experience
Job Overview by Ladders

Qualifications

  • 3+ years of production iOS experience, preferably in fintech or trading
  • Strong UX/UI design sensibility with experience in wireframing and prototyping
  • Proven history of shipping apps through the Apple App Store
  • Deep understanding of iOS performance, memory management, and background processing
  • Experience with real-time systems and live data streams
  • Ownership mindset, capable of architectural decisions and leading projects
  • Must be authorized to work in the United States

Responsibilities

  • Design responsive features for iOS that perform well during market volatility
  • Build gesture-driven mobile UI for comprehensive trading functionalities
  • Develop high-performance, interactive data visualizations
  • Create secure wallet integrations and implement biometric authentication
  • Integrate complex REST APIs and manage client-side cache
  • Configure and maintain CI/CD pipelines for smooth deployment and testing
  • Ensure the app maintains performance under high-load market conditions

Benefits

  • Collaborative, high-bandwidth engineering environment
  • Opportunities for professional growth in the fintech sector
  • Involvement in building cutting-edge mobile technology
  • Focus on real-time applications that directly impact users
  • Support for automated build and testing processes
Full Job Description
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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