Freelance Mobile App Developer (iOS / Android)

Role Overview

Freelance Mobile App Developer for the Tendem project (Tendem.ai). You’ll build native and cross-platform mobile applications for real-world use cases on iOS, Android, or both.

Responsibilities

• Design, build, and refine mobile apps across categories (utilities, fitness/wellness, games, productivity, delivery, content)
• Develop with React Native, Flutter, Swift (iOS), or Kotlin (Android)
• Create responsive UIs following platform conventions (iOS HIG, Material Design)
• Integrate native device features: camera, push notifications, location, storage, biometrics
• Connect apps to backend REST APIs; handle offline state, caching, and sync
• Implement monetization features when needed: in-app purchases, ads, subscriptions
• Review, debug, optimize, and refactor for correctness, performance, battery efficiency, and maintainability
• Debug platform-specific issues and prepare builds for distribution (TestFlight, Play Console)

Requirements

• At least 3 years of relevant mobile app development experience (required)
• Hands-on experience shipping iOS and/or Android apps
• Strong understanding of mobile UI patterns, navigation, and state management
• Experience integrating REST APIs and managing async data + local storage
• Familiarity with native device APIs (notifications, camera, location, storage, biometrics)
• Experience with mobile build tools, code signing, and App Store / Google Play submissions
• English proficiency B2 or above (required)
• Portfolio of shipped mobile apps (required; App Store / Google Play links preferred)

Nice to Have

• Experience with Firebase, Supabase, or similar backend services
• Experience with in-app purchases/ads/subscriptions
• Proficiency with Kotlin/Jetpack Compose (Android) and/or SwiftUI (iOS)
• Bachelor’s or Master’s degree in CS/Engineering/IT (or related)

Logistics & Compensation

• Part-time remote; estimated 10–20 hours/week during active phases
• Earn up to $60/hour equivalent depending on level and contribution pace