Mobile Engineer - React Native

October 15, 2026

Remote

Middle

Lisboa

Indeed

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English is required
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Description

Tether is hiring a Mobile Engineer to develop and maintain Keet Mobile, a peer-to-peer chat and calling app for iOS and Android built with React Native and Expo. The app's P2P core runs on-device in a Bare worklet and reuses 100% of Keet Desktop's code, while the UI layer is fully React Native. The role offers end-to-end feature ownership and close collaboration with the core P2P, design and product teams. This is a 100% remote position open to candidates worldwide.

Responsibilities

Develop and maintain Keet Mobile, a P2P chat and calling app for iOS and Android
Own features end to end, from UI/UX implementation to using the P2P core APIs
Build and polish features across chat, voice and video calls, media sharing, device pairing and identity backup
Integrate native platform capabilities such as push notifications, camera, biometrics and background tasks on both iOS and Android
Profile and optimise performance on real devices, including startup time, long chats, media handling, battery and network use
Write unit and end-to-end tests and help keep releases stable through CI and crash reporting
Work closely with the core P2P, design and product teams and review code with a high bar for quality

Requirements

Significant experience with React Native
Redux for state management and Redux-Saga
Highly proficient in JavaScript and ES6+
Experienced with WebSockets and RESTful APIs
Knowledge of native languages Swift/Kotlin and familiarity with Xcode/Android Studio is advantageous
Experience working with a remote team
Interest in modernizing and optimizing mobile or web applications
Bonus for building something on P2P frameworks