Freelance Mobile App Developer (iOS / Android)

About the role

Mindrift is looking for skilled Mobile App Developers (React Native, Flutter, Swift, or Kotlin) to join the Tendem project. This role involves collaborating with Tendem Agents to build native and cross-platform mobile applications within a hybrid AI + human environment. You will provide mobile engineering expertise, platform-specific judgment, and quality control to ensure apps are stable, performant, and ready for real users on real devices.

Responsibilities

• 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.
• 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.
• Evaluate AI-generated mobile code and refactor it for correctness, performance, battery use, and maintainability.
• Debug platform-specific issues and prepare builds for distribution (TestFlight, Play Console).

Requirements

• At least 3 years of relevant experience in mobile app development.
• A Bachelor's or Master's Degree in Computer Science, Engineering, Information Technology, or related technical fields is a plus.
• Strong foundation in mobile application development, platform-specific UI/UX patterns, and building stable, high-quality mobile experiences for iOS and Android.
• 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.
• Familiarity with backend services such as Firebase, Supabase, or similar.
• 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.

Benefits

• Portfolio of shipped mobile apps (required, with App Store / Google Play links preferred).
• English proficiency: Upper-intermediate (B2) or above.

Project time expectations

Tasks are estimated to require around 10-20 hours per week during active phases, based on project requirements.

Compensation

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.