Sr. Mobile Engineer II

NinjaTrader•Chicago, IL

18h•$125,000 - $175,000•Hybrid

About The Position

Welcome to the dynamic world of NinjaTrader! As an industry-leading trading platform and futures broker, we're empowering traders to take control of their financial destiny. How do we do it? We provide cutting-edge products and services that enhance the trading journey. Whether a seasoned pro or just starting out, NinjaTrader equips traders with award-winning software and brokerage services to navigate the world's leading financial markets with confidence. Our growth story is nothing short of exhilarating. Since 2003, NinjaTrader has been dedicated to understanding and supporting traders on their journey toward trading triumph. Through those efforts, our user base has grown to over 2 million users and we have become the number one rated futures brokerage worldwide. But we're not stopping there. We're constantly evolving, pushing boundaries, and modernizing the futures industry. Our commitment to innovation means users will always have access to dynamic tools, real-time support, and a community of like-minded traders. So, why work at NinjaTrader? Here, you're not just part of a team; you're part of a movement. We empower employees to reach new heights in their careers by providing a dynamic culture focused on social connection, professional development, and employee recognition initiatives. Sounds too good to be true? Take it from our employees. Join us as we redefine what's possible in trading, advocate for our customers, and continue our journey toward becoming the world's top retail-focused trading platform in the world.

Requirements

6+ years of professional software engineering experience
2+ years of hands-on Flutter and Dart experience in production environments
Understanding of mobile architecture, state management, and design patterns (e.g., BLoC, MVVM, Clean Architecture)
Experience maintaining testing strategies for Flutter applications, spanning unit, widget, integration, and end-to-end levels
Familiarity with building CI/CD automation for mobile delivery
Understanding of RESTful APIs, WebSockets, and offline data handling
Familiarity with optimizing performance, reliability, and user experience across diverse devices
Ability to perform in a team environment adopting agile principles
Strong written and verbal communication skills
Strong grasp of OOP design principles

Nice To Haves

Knowledge of native iOS (Swift) and Android (Kotlin/Java) integration
Experience with fintech or trading platforms
Contributions to open-source frameworks or SDKs

Responsibilities

Own the life cycle of features through debugging, documenting, testing, releasing, and monitoring
Take part in daily stand-ups and regular team-wide meetings to discuss current and upcoming tasks
Participate in the technical roadmap for mobile architecture, frameworks, and tooling
Participate in design reviews, architecture discussions, and performance optimization efforts across iOS and Android
Implement robust, maintainable Flutter solutions that follow best practices for state management, dependency injection, and reactive programming
Collaborate with Product and Design teams to iteratively improve the user experience on mobile platforms
Investigate issues, mitigate them, and recommend preventative measures
Improve observability, monitoring, and crash analytics to ensure product stability and quality
Help foster a culture of technical excellence, innovation, and collaboration