Senior Mobile UI Developer (React Native)

Position Title: Senior Mobile UI Engineer (React Native)Location: Hybrid in Birmingham, ALPosition Status: Contract to HireAbout the RoleWe 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.What You'll DoDesign, develop, and maintain production-grade mobile application features using React Native and TypeScriptContribute to the modernization of an existing enterprise mobile app, improving performance, usability, and scalabilityBuild robust, reusable UI components and help shape long-term mobile architecture and design patternsIntegrate 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 authenticationOptimize mobile app performance across devices, OS versions, and network conditionsWrite 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 teamsParticipate in code reviews, architectural discussions, and Agile ceremoniesMentor and support other developers, promoting best practices and high engineering standardsStay current with mobile development trends, tools, and frameworks to continuously improve the app and teamRequired Qualifications10+ years of professional software development experience, with significant hands-on mobile application experienceStrong React Native experience building real-world mobile apps (iOS and Android)Excellent TypeScript and modern JavaScript (ES6+) skillsExperience building and maintaining mobile apps used at scale (internal or external)Deep understanding of mobile UI/UX principles, performance optimization, and device constraintsHands-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 GraphQLFamiliarity with CI/CD pipelines, Git-based version control, and automated testingStrong problem-solving skills, attention to detail, and the ability to work effectively in a collaborative teamNice to HaveExperience with Ionic / Capacitor or hybrid mobile platformsExposure to Java-based backends and enterprise APIsExperience integrating with Microsoft enterprise tools (Dynamics 365, Power BI, Azure services)Knowledge of mobile security best practices, authentication, and authorizationPrevious experience modernizing or refactoring legacy mobile applicationsAbout Seneca Resources:At Seneca Resources, we are more than just a staffing and consulting firm, we are a trusted career partner. With offices across the U.S. and clients ranging from Fortune 500 companies to government organizations, we provide opportunities that help professionals grow their careers while making an impact.When you work with Seneca, you're choosing a company that invests in your success, celebrates your achievements, and connects you to meaningful work with leading organizations nationwide. We take the time to understand your goals and match you with roles that align with your skills and career path. Our consultants and contractors enjoy competitive pay, comprehensive health, dental, and vision coverage, 401(k) retirement plans, and the support of a dedicated team who will advocate for you every step of the way.

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