Senior Mobile UI Developer

About the role

We are seeking a Senior Mobile UI Engineer to play a key role in modernizing a large-scale, internal mobile application used daily by approximately 5,000 employees. This is a hands-on, senior-level role focused on building secure, high-performance mobile applications (iOS/Android)—not web sites or responsive web pages. You will work on a mobile application with third-party system integrations, including Microsoft Dynamics 365, Power BI, and other enterprise platforms, while helping evolve the app’s architecture, UI patterns, and security model.

Responsibilities

• Design, develop, and maintain production-grade mobile application features using React Native and TypeScript
• Contribute to the modernization of an existing enterprise mobile app, improving performance, usability, and scalability
• Build robust, reusable UI components and help shape long-term mobile architecture and design patterns
• Integrate mobile UI with complex backend systems and third-party APIs, including Microsoft platforms (Dynamics 365, Power BI)
• Implement and maintain secure authentication flows, including multi-factor and two-factor authentication
• Optimize mobile app performance across devices, OS versions, and network conditions
• Write clean, testable, well-documented code with strong test coverage (unit and integration testing)
• Collaborate closely with UX/UI designers, backend engineers, product owners, and platform teams
• Participate in code reviews, architectural discussions, and Agile ceremonies
• Mentor and support other developers, promoting best practices and high engineering standards
• Stay current with mobile development trends, tools, and frameworks to continuously improve the app and team

Requirements

• 10+ years of professional software development experience, with significant hands-on mobile application experience
• Strong React Native experience building real-world mobile apps (iOS and Android)
• Excellent TypeScript and modern JavaScript (ES6+) skills
• Experience building and maintaining mobile apps used at scale (internal or external)
• Deep understanding of mobile UI/UX principles, performance optimization, and device constraints
• Hands-on experience with unit and integration testing (Jest, React Testing Library or similar)
• Solid knowledge of mobile application state management (Redux, Zustand, Recoil, etc.)
• Experience integrating with RESTful APIs and/or GraphQL
• Familiarity with CI/CD pipelines, Git-based version control, and automated testing
• Strong problem-solving skills, attention to detail, and the ability to work effectively in a collaborative team

Nice to have

• Experience with Ionic / Capacitor or hybrid mobile platforms
• Exposure to Java-based backends and enterprise APIs
• Experience integrating with Microsoft enterprise tools (Dynamics 365, Power BI, Azure services)
• Knowledge of mobile security best practices, authentication, and authorization
• Previous experience modernizing or refactoring legacy mobile applications