Sr. Mobile Engineer II

NinjaTrader
Chicago, IL
Hybrid

Who this role is best for

Geared toward experienced Flutter engineers comfortable with cross-platform mobile development, this role emphasizes collaboration with product and design teams and requires a strong grasp of engineering best practices. It offers hybrid work flexibility for Chicago-based candidates and remote options in select US states.

Best fit for

  • Experienced Flutter engineers with a track record of delivering scalable and high-performance applications
    — “deliver scalable, high-performance applications that provide a seamless cross-platform experience”
  • Candidates who have shaped technical direction and driven quality in mobile product development
    — “shape technical direction across teams, set a high standard for engineering excellence”
  • Individuals with a background in state management, dependency injection, and reactive programming
    — “implement robust, maintainable Flutter solutions that follow best practices for state management, dependency injection, and reactive programming”

Things to consider

  • Hybrid work requires in-office presence three days a week for Chicago-based employees
    — “In-office Tuesday through Thursday, with remote work on Mondays and Fridays”
  • Remote flexibility is limited to specific states and may not be available everywhere
    — “remote flexibility for exceptional candidates in the following states”

How to stand out

  • Highlight experience with Flutter in production environments and cross-platform solutions
    — “2+ years of hands-on Flutter and Dart experience in production environments”
  • Emphasize contributions to technical direction and team mentorship in your resume and interviews
    — “champion the execution of our mobile architecture, mentor engineers”
  • Demonstrate your ability to optimize performance and user experience across diverse devices
    — “familiarity optimizing performance, reliability, and user experience across diverse devices”
  • Showcase your experience with RESTful APIs, WebSockets, and offline data handling
    — “understanding of RESTful APIs, WebSockets, and offline data handling”
  • Include examples of your work with testing strategies for Flutter apps at multiple levels
    — “experience maintaining testing strategies for Flutter applications, spanning unit, widget, integration, and end-to-end levels”
Pace · SteadyCollaboration · HighAutonomy · MediumDecision Impact · Team

Derived from job-description analysis by Serendipath's career intelligence engine.

What success looks like

  • deliver scalable, high-performance applications
  • provide a seamless cross-platform experience
  • shape technical direction
  • drive quality and reliability
Typical background
software engineeringmobile development

Skills & requirements

Required

FlutterDartCross-platform DevelopmentMobile ArchitectureState ManagementDependency InjectionReactive ProgrammingUser Experience ImprovementObservabilityMonitoringCrash AnalyticsTechnical ExcellenceInnovationCollaboration

Preferred

Futures Trading Experience

Stack & domain

FlutterDartFinance

About the role

Original posting from NinjaTrader via Greenhouse

Disclaimer: Please be advised that the most accurate and up-to-date information about our open roles—including job descriptions, compensation, and benefits—can only be guaranteed on our official job board. For the latest listings and details, please visit: https://job-boards.greenhouse.io/ninjatrader.

JOIN US ON OUR MISSION TO BECOME THE #1 RETAIL TRADING PLATFORM IN THE WORLD

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.  

What you'll do:

Join our Mobile Engineering team as a Sr. Software Engineer II specializing in Flutter. You will champion the execution of our mobile architecture, mentor engineers, and deliver scalable, high-performance applications that provide a seamless cross-platform experience. You will also shape technical direction across teams, set a high standard for engineering excellence, and drive quality and reliability across our mobile products.

In this role you will:

Own the life cycle of features through debugging, documenting, testing, releasing, and monitoring

Attend daily stand-ups and regular team-wide meetings to discuss current and upcoming tasks

Contribute to 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 oncmobile 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'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 (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 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 10%. 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

Our Core Benefits Include:

Generous PTO

7 Paid Holidays Annually + 5 Conditional Holidays Annually

1 Service Day Annually

401k with 3.5% Company Match

Paid Parental Bonding Leave

Health, Vision, Dental Coverage

Life and Disability Insurance Covered 100% by NinjaTrader

We are committed to equal employment opportunity regardless of race, color, ancestry, religion, sex, national origin, sexual orientation, age, citizenship, marital status, disability, gender, gender identity or expression, or veteran status. We are proud to be an equal opportunity workplace.

Source: NinjaTrader careers (Greenhouse)

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