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Freelance Mobile App Developer (iOS / Android)

1 day, 12 hours ago
Spain
Freelance
Mid Level
Mobile Engineer
Software Development
Android Firebase Flutter iOS Jetpack Compose Kotlin React Native REST API Supabase Swift SwiftUI
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Internet Software & Services
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Description

  • Build mobile applications using React Native, Flutter, Swift, or Kotlin.
  • Design and implement responsive mobile UIs that follow iOS and Android platform conventions.
  • Integrate native device features such as camera, push notifications, location, storage, and biometrics.
  • Connect mobile apps to backend APIs and handle offline state, caching, and synchronization.
  • Implement monetization features such as in-app purchases, ads, and subscriptions when required.
  • Review AI-generated mobile code and refactor it for correctness, performance, battery efficiency, and maintainability.
  • Debug platform-specific issues and prepare app builds for distribution through TestFlight and Google Play Console.
  • Work across the full mobile development lifecycle for apps in categories such as utilities, fitness, games, productivity, delivery, and content.

Requirements

  • At least 3 years of relevant experience in mobile app development.
  • Hands-on experience with at least one framework or language: React Native, Flutter, Swift/SwiftUI, or Kotlin/Jetpack Compose.
  • Strong understanding of mobile UI patterns, navigation, state management, and platform guidelines.
  • Experience integrating REST APIs, handling asynchronous data, and managing local storage.
  • Familiarity with native device APIs such as notifications, camera, location, storage, and biometrics.
  • Experience with mobile build tools, code signing, and submitting apps to the App Store and 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.
  • Bachelor's or Master's degree in Computer Science, Engineering, Information Technology, or a related technical field is a plus.
  • Portfolio of shipped mobile apps is required, with App Store or Google Play links preferred.
  • Upper-intermediate English proficiency (B2) or above is required.
  • Strong attention to detail, performance awareness, and the ability to work independently are essential.
  • Self-directed work ethic with the ability to ship complete mobile features independently.

Benefits

  • Fully remote work on your own schedule with just a laptop and stable internet connection.
  • Up to $50 per hour equivalent, depending on level and pace of contribution.
  • Performance-based bonus programs for high-quality work and consistent delivery.
  • Part-time workload of around 10–20 hours per week during active project phases.
  • Hands-on experience in a hybrid environment where human experts and AI agents collaborate.

Interested in this position?

Apply directly on the company website

Apply Now

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