Mobile App Engineer Mobile App Engineer Mobile App Engineer

HireChain Ltd; New York, Northern (NY, KY); Hybrid; USD 185,000 - 300,000; Full time

Benefits offered by this job

Health & wellness insurance

Generous vacation

Retirement plan with employer match

Equity

Job summary

Fullstack.Trade is seeking a Mobile Engineer to help build the next generation mobile trading app. You will create an iOS app that handles live market data, complex orders, and multi-venue execution with real-time performance and secure on-device signing.

In this role, you will craft gesture-driven interfaces, visually rich charts, and wallet integrations while ensuring a robust architecture and scalable client-side state.

Qualifications

• 3+ years shipping iOS applications in Swift, fintech, trading, or real-time data environments.
• Strong eye for UI/UX; wireframing, prototyping, and design decisions.
• Shipped apps through the Apple App Store; full release cycle knowledge from provisioning to production.
• Deep understanding of iOS performance, memory management, and background processing.
• Experience building apps that handle live data streams; manage WebSocket connections and keep UI responsive.
• Able to make architectural decisions and lead feature development in a team.
• Must be authorized to work in the United States.

Responsibilities

• Design features that stay responsive during market volatility and handle real-time data efficiently.
• Build gesture-driven mobile UI that delivers high information density without overwhelming small screens.
• Develop high-performance, real-time visualizations and charts for trading insight.
• Integrate with mobile wallets and biometric authentication; secure key management on-device.
• Layout and integrate REST APIs and WebSocket streams with robust client-side caching.
• Configure and maintain CI/CD pipelines for automated builds, previews, testing, and seamless rollbacks.

Skills

Production iOS Experience

Design Sensibility

App Store Experience

Platform Knowledge

Real-Time Systems

Ownership Mindset

Work Authorization

Job description

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 synchronised 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.

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

Ownership

Health & Wellness (Comprehensive medical, dental, and vision insurance with HSA options.)

Generous paid vacation and holidays

Retirement plan with employer match.

Culture (Flat, engineering-driven environment where the best idea wins.)

Compensation & Package

Base Salary + Equity

Ownership

Health & Wellness (Comprehensive medical, dental, and vision insurance with HSA options.)

Generous paid vacation and holidays

Retirement plan with employer match.

Culture (Flat, engineering-driven environment where the best idea wins.)

Interview Process

• Founder / CEO Interview
• Take Home Test
• Technical Interview
  • Onsite coding interview
• Final Interview
  • Hiring Criteria
  • 3+ years shipping iOS applications in Swift, ideally in fintech, trading, or real-time data environments.
  • Strong eye for UI/UX. Comfortable wireframing, prototyping, and making design decisions. Understand information hierarchy and gesture-driven interfaces.
  • Shipped apps through the Apple App Store. Understand the full release cycle from provisioning to review to production.
  • Deep understanding of iOS performance characteristics, memory management, and background processing.
  • Experience building apps that handle live data streams. Know how to manage WebSocket connections, handle reconnection, and keep UI responsive.

Location

New York, US (Office) - Must be open to working fully office based in NYC (Paradigm Offices)

$185K - $300K

Fullstack.Trade

Multi asset margin and fixing the fragmentation problem in crypto by creating the only front end you'll ever need.