Sr. Software Test Engineer, Mobile

NinjaTrader•Chicago, IL

3d•$100,000 - $150,000•Hybrid

About The Position

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: 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.

Requirements

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

Nice To Haves

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

Responsibilities

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

Benefits

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.
20 additional flex remote days annually
5 Company Wide Office-Optional weeks tied to major holidays
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