Sr. Software Test Engineer, Mobile

NinjaTrader • Chicago, IL

19h • $100,000 - $150,000 • Hybrid

About The Position

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:

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.
• 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

What This Job Offers

• Job Type: Full-time
• Career Level: Mid Level
• Education Level: No Education Listed
• Number of Employees: 101-250 employees