Mindrift is looking for skilled Mobile App Developers (React Native Flutter Swift or Kotlin) to join the Tendem project ( https//tendem.ai/ ) and build native and cross-platform mobile applications for real-world use cases. In this role you ll apply your mobile engineering expertise to build stable performant and user-friendly applications for iOS and Android. This part-time remote opportunity is ideal for professionals with hands-on experience shipping iOS and/or Android apps working with platform APIs and handling the full mobile development lifecycle. What We Do The Mindrift platform connects specialists with innovative technology projects. Our mission is to help develop high-quality AI technologies by combining real-world expertise from professionals across the globe with advanced AI development efforts. About the Role This is a freelance role for a Tendem project. As a Mobile App Developer you ll design build and refine mobile applications across categories such as utilities fitness/wellness games productivity delivery and content apps — for iOS Android or both using native or cross-platform frameworks. Key Responsibilities Build mobile applications using React Native Flutter Swift (iOS) or Kotlin (Android). Implement responsive mobile UIs that follow platform conventions (iOS HIG Material Design). Integrate native device features (camera push notifications location storage biometrics). Connect apps to backend APIs handle offline state caching and synchronization. Implement monetization features where required (in-app purchases ads subscriptions). Review debug optimize and refactor mobile application code to improve correctness performance battery efficiency and maintainability. Debug platform-specific issues and prepare builds for distribution (TestFlight Play Console). Educational qualifications At least 3 years of relevant experience in mobile app development (required). Bachelor s or Master s Degree in Computer Science Engineering Information Technology or related technical fields is a plus. Academic and/or Professional Experience Candidates should have a strong foundation in mobile application development platform-specific UI/UX patterns and building stable high-quality mobile experiences for iOS and Android. We are looking for specialists who can confidently work with native or cross-platform frameworks integrate device APIs and backend services and build production-ready mobile applications. Strong attention to detail performance awareness and the ability to work independently are essential. Technical Skills (Essential) Hands-on experience with at least one of React Native Flutter Swift/SwiftUI (iOS) or Kotlin/Jetpack Compose (Android). Solid understanding of mobile UI patterns navigation state management and platform guidelines. Experience integrating REST APIs handling async data and managing local storage. Familiarity with native device APIs (notifications camera location storage biometrics). Experience with mobile build tools code signing and submission to App Store / Google Play. Experience implementing in-app purchases ads or subscriptions is a plus. Familiarity with backend services such as Firebase Supabase or similar is a plus. Additional requirements Strong attention to detail and commitment to performance stability and platform polish. Self-directed work ethic with the ability to ship complete mobile features independently. Portfolio of shipped mobile apps (required with App Store / Google Play links preferred). English proficiency Upper-intermediate (B2) or above (required) Project time expectations For this project tasks are estimated to require around 10–20 hours per week during active phases based on project requirements. This is an estimate not a guaranteed workload and applies only while the project is active. Compensation On this project contributors can earn up to $60 per hour equivalent depending on their level and pace of contribution. Compensation varies across projects depending on scope complexity and required expertise. Please note that other projects on the platform may offer different earning levels based on their requirements. Why this freelance opportunity might be a great fit for you? Work fully remote on your own schedule with just a laptop and stable internet connection. Apply your expertise to real-world technology projects while gaining experience building high-quality solutions for a global platform. Participate in performance-based bonus programs that reward high-quality work and consistent delivery.