Sr. Mobile Engineer I

NinjaTrader; Chicago (IL); Hybrid; USD 125,000 - 175,000; Full time

Benefits offered by this job

Generous PTO

Paid holidays

Company 401k match

Parental leave

Health coverage

Vision coverage

Dental coverage

Life Insurance

Disability insurance

Job summary

NinjaTrader is seeking an experienced Sr. Mobile Engineer I to lead mobile architecture and deliver scalable Flutter-based apps. You will mentor engineers, shape technical direction, and ensure end-to-end quality for iOS and Android platforms.

Join a dynamic team in a hybrid Chicago-based role, driving innovation, performance, and a strong mobile product experience for millions of traders.

Qualifications

• 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.

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.

Skills

Software engineering

Flutter

Dart

Mobile development

CI/CD

REST APIs

Tools

Flutter framework

Dart language

iOS

Android

BLoC

Job description

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

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 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 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

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 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

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 $125,000.00 - $175,000.00 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. We are not open to remote candidates for this role

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.