Sr. Mobile Engineer I

Join us on our mission to become the #1 retail trading platform in the world. As an industry-leading trading platform and futures broker, NinjaTrader empowers traders with cutting-edge products and services to navigate the world's leading financial markets. With over 2 million users and a top-rated futures brokerage, we are dedicated to innovation, dynamic tools, real-time support, and a community of like-minded traders.

About the role

We are seeking a highly skilled and experienced engineer specializing in Flutter to join our Mobile Engineering Team. As a Sr. Mobile Engineer I, you will lead mobile architecture, mentor engineers, and deliver scalable, high-performance applications that power a seamless cross-platform experience. You will influence technical direction, set a high standard for engineering excellence, and drive end-to-end quality and reliability in our mobile products.

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

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

Skills

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

Pay

The salary range for this role is $125,000.00 - $175,000.00 USD. This position also includes an annual target bonus of 12%, based on individual performance (50%) and company/team performance (50%).

Schedule

This role is based in Chicago, IL, following a hybrid work schedule: in-office Tuesday through Thursday, with remote work on Mondays and Fridays. Additional benefits include 20 flex remote days annually and 5 company-wide office-optional weeks tied to major holidays.

Benefits

• Generous PTO (18 days per year plus 7 paid holidays and 5 conditional holidays)
• 1 service day annually
• 401k with 3.5% company match
• Paid parental bonding leave
• Health, vision, and dental coverage
• Life and disability insurance covered 100% by NinjaTrader