Senior Flutter Mobile Engineer - Fintech Trading (Equity)

The Bitcoin Street Journal; New York, Northern (NY, KY); Hybrid; USD 140,000 - 210,000; Full time

Benefits offered by this job

Health benefits

Equity

5% 401(k) match

One-time office setup stipend

Flexible PTO

Life insurance

Job summary

You will collaborate with Design, Product, and Growth, mentor others, and contribute to on-call incident response. NYC-pref, remote-friendly NAMER-wide.

Qualifications

• 6–10+ years of professional mobile development.
• 3+ years of Flutter in production or React Native, Kotlin, Swift.
• Strong understanding of mobile architectures and tradeoffs.
• Experience building design systems/UI libraries in Flutter or other frameworks.
• Solid engineering fundamentals: testing and release management.
• Mentoring other engineers and collaborating with teams.

Responsibilities

• Own the architecture and long-term evolution of the Flutter app for iOS and Android.
• Design and maintain a company-wide mobile design system and component library.
• Build interactive trading experiences: live prices, charts, orders, history, notifications.
• Improve performance: profiling, memory optimization, reduce crashes.
• Implement automated testing and assist in release/QA processes.
• Collaborate with Product/Growth to integrate analytics and feature flags.
• Work with Backend/Platform on API design and resilience.
• Lead code reviews, design docs, and mentorship.
• Participate in on-call rotations and drive root-cause fixes.

Skills

Flutter

React Native

Kotlin/Swift

Mobile architecture

Design system

Testing/CI

Mentoring

Education

B.S. in CS or related

Tools

Xcode

Android Studio

CI/CD tooling

Job description

You will collaborate with Design, Product, and Growth, mentor others, and contribute to on-call incident response. NYC-pref, remote-friendly NAMER-wide.