What you'll do:
We are seeking a highly skilled and experienced Engineer specializing in Flutter to join our Mobile Engineering Team. As a Sr. Mobile Engineer II, 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 across teams, set a high standard for engineering excellence, and drive end-to-end quality and reliability in our mobile products.
In this role you will:
- Own the life cycle of features through testing, debugging, documenting, releasing, and monitoring
- Take part in daily standups 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
What you'll need:
- 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 (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 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
Bonus Points for:
- Knowledge of native iOS (Swift) and Android (Kotlin/Java) integration
- Experience with fintech or trading platforms
- Contributions to open-source frameworks or SDKs
Compensation:
The salary range for this role will be $140,000.00 - $190,000.00 USD. In addition, this position will also receive an annual target bonus of 12%. Bonus pay at NinjaTrader is based on individual performance (50%) as well as company/team performance (50%).
Salary and bonus earnings are only two components of the total compensation package offered by NinjaTrader. NinjaTrader offers a 401K plan through ADP under which the company will match up to 3.5% of employee contributions. Annual paid time off allowance accrues at a rate of 18 days per year (some positions may qualify for more) plus seven paid holidays.
Location:
This role is based in Chicago, IL. *There may be remote flexibility for exceptional candidates in the following 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, Wisconsin.
Hybrid:
For Chicago-based employees, we follow a hybrid work schedule: In-office Tuesday through Thursday, with remote work on Mondays and Fridays. In addition to these weekly remote days, we offer:
- 20 additional flex remote days annually
- 5 Company Wide Office-Optional weeks tied to major holidays