What you'll do:

Mobile is central to how NinjaTrader reaches the next generation of retail traders. Our Flutter-based platform runs on iOS and Android, and the bar for quality is high — traders make real financial decisions on it. As a Sr. Software Engineer in Test on the Mobile team, you will own automation and quality for our mobile applications, working as a peer to Flutter engineers and product managers. You will shape how our apps are built to be testable, not just verify what ships.

In this role you will:

• Architect, build, and maintain a scalable end-to-end mobile automation framework for our Flutter-based iOS and Android applications
• Lead automation efforts across both platforms, with a focus on long-term framework stability and coverage
• Implement and enhance mobile automation using Appium, WebdriverIO, or similar automation frameworks
• Design and enforce a Screen/Page Object Model architecture and project structure that scales with the mobile team
• Write maintainable automation code in TypeScript/JavaScript, establishing standards others build on
• Partner with Flutter engineers on application architecture to identify testability gaps and make automation-friendly design decisions early — before they become late-stage problems
• Own CI/CD integration for mobile test pipelines: tagging strategies (e.g., smoke, regression), automated reporting, and pipeline reliability
• Identify, analyze, and eliminate test flakiness — treating automation reliability as a product quality concern
• Apply AI-assisted development tools — code generation, test generation, failure analysis — to improve coverage and productivity
• Drive improvement in mobile testing tooling and documentation
• Contribute to junior QA team members' growth through code reviews, pairing, and direct feedback
• Uphold NinjaTrader SDLC and information security standards

What you'll need:

• 7+ years of experience in QA engineering and test automation, with significant mobile automation experience
• Proven experience building and scaling mobile E2E automation frameworks for iOS and Android
• Strong hands-on experience with Appium, WebdriverIO, or comparable mobile automation tools
• Demonstrated experience working with mobile engineers on testability-by-design
• Deep understanding of Screen/Page Object Model or equivalent patterns for mobile test architecture
• Strong proficiency in TypeScript or JavaScript
• Experience with CI/CD tooling for mobile delivery, including GitHub Actions
• Experience designing test strategies that integrate into automated pipelines at scale
• Proven proficiency with AI-assisted engineering tools applied responsibly in a mobile QA context
• Track record of improving automation stability and reducing flakiness
• Strong communication and collaboration skills — comfortable as a peer to Flutter engineers and product managers

Bonus points for:

• Hands-on experience with Flutter-native testing tools (flutter_test, integration_test package)
• Familiarity with iOS and Android internals, simulators, and emulators
• Experience with cloud device labs (e.g., Sauce Labs, BrowserStack, or similar)
• API automation testing experience
• Accessibility testing awareness (WCAG or mobile platform standards)
• Financial trading systems or fintech experience

Compensation:

The salary range for this role will be $100,000.00 - $150,000.00 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. 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

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