Sr. Mobile Engineer I

As a Sr. Mobile Engineer I at NinjaTrader, you will lead mobile architecture and mentor engineers on a team building scalable, high-performance Flutter applications. You'll influence technical direction across teams, set standards for engineering excellence, and drive end-to-end quality and reliability in mobile products that power a cross-platform trading experience for over 2 million users.

What you'll do

• Own the full lifecycle of features through debugging, documenting, testing, releasing, and monitoring
• Participate 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 following 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
• Foster a culture of technical excellence, innovation, and collaboration

What you bring

• 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 such as BLoC, MVVM, and 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 have

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

What we offer

• Salary range of $125,000-$175,000 USD plus an annual target bonus of 12% based on individual performance (50%) and company/team performance (50%)
• 401(k) plan with company match up to 3.5% of employee contributions
• 18 days of paid time off annually plus 7 paid holidays
• Health, vision, and dental coverage
• Life and disability insurance covered 100% by NinjaTrader
• Paid parental bonding leave
• 1 service day annually
• Hybrid work schedule for Chicago-based employees: in-office Tuesday through Thursday, remote on Mondays and Fridays, plus 20 additional flex remote days annually and 5 company-wide office-optional weeks tied to major holidays
• Remote flexibility available for exceptional candidates in select states: California, Colorado, Florida, Georgia, Illinois, Indiana, Minnesota, Missouri, Montana, New Jersey, New York, North Carolina, Ohio, Oregon, Pennsylvania, South Carolina, Texas, Utah, Vermont, Virginia, Washington, Washington DC, and Wisconsin

About NinjaTrader

NinjaTrader is an industry-leading trading platform and futures broker serving over 2 million users worldwide. Since 2003, the company has provided award-winning software and brokerage services to traders and is the number one rated futures brokerage globally. NinjaTrader is committed to innovation and modernizing the futures industry.