React Native Engineer — Cross-Platform Mobile Apps

Syntheia; United States; Remote; USD 110,000 - 150,000; Full time

Job summary

Syntheia is seeking a mobile engineer to build and maintain polished cross‑platform apps for iOS and Android. You will work across healthcare, logistics, and consumer projects, focusing on React Native and Expo to deliver reliable releases.

You will optimize performance, implement offline data sync, push notifications, and secure authentication, and you may integrate native Swift or Kotlin modules when needed.

Qualifications

• Experience building and maintaining mobile apps with React Native and Expo.
• Ability to implement offline data synchronization, push notifications, and secure authentication.
• Familiarity with integrating native iOS or Android modules using Swift or Kotlin.
• Ability to manage releases and address crash monitoring and performance issues.

Responsibilities

• Develop cross-platform mobile apps with React Native and Expo.
• Implement offline-first data synchronization, push notifications, and secure authentication.
• Integrate native Swift or Kotlin modules when application performance requires it.
• Manage app store releases and monitor crashes after deployment.
• Tune app performance and maintain existing applications.

Skills

React Native

Expo

Offline-first data sync

Push notifications

Secure authentication

Swift integration

Kotlin integration

Crash monitoring

App store releases

Performance tuning

Tools

Swift

Kotlin

React Native

Expo

Job description

Syntheia is seeking a mobile engineer to build and maintain polished cross‑platform apps for iOS and Android. You will work across healthcare, logistics, and consumer projects, focusing on React Native and Expo to deliver reliable releases.

You will optimize performance, implement offline data sync, push notifications, and secure authentication, and you may integrate native Swift or Kotlin modules when needed.