Tether.io

Mobile Engineer - React Native (100% Remote) - Worldwide

In short

This role involves developing and maintaining Keet Mobile, a peer-to-peer chat and calling app for iOS and Android built with React Native and Expo, whose P2P core runs on-device in a Bare worklet. Tether is a global fintech company behind the USDT stablecoin and other blockchain, energy, data and education products, working fully remotely worldwide. The job demands significant experience with React Native, Redux and Redux-Saga, strong JavaScript/ES6+ skills, WebSockets and REST API experience, and ownership of features end-to-end including native integrations and performance optimization. This posting is restricted to candidates in the United Kingdom.

# About the job
We have launched Keet Mobile on iOS and Android, bringing our full P2P technology stack to everyone. Keet Mobile is not your average app: its heavy lifting is performed by a custom JS runtime specially designed for peer-to-peer usage (in fact, it reuses 100% of Keet Desktop's code!). The UI logic, on the other hand, is 100% React Native, giving us flexibility and the ability to iterate quickly.
We believe this pattern opens the door to huge possibilities in the future, and we need your help getting there!
Responsibilities
In this role, you will develop and maintain Keet Mobile, our peer-to-peer chat and calling app for iOS and Android. Keet Mobile is built with React Native and Expo, and its P2P core runs on the device itself in a Bare worklet. You'll own features end to end, from UI/UX implementation to using the P2P core apis.
You will:
•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, bio-metrics 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, RESTful based APIs
•Knowledge in native languages (Swift/Kotlin) and familiarity with native build tools (Xcode/Android Studio) is advantageous
•Experience working with a remote team
•Interested in modernizing and optimizing different mobile or web applications
•Bonus points if you have built something amazing on any p2p frameworks
About Tether
At Tether, we're not just building products, we're pioneering a global financial revolution. Our cutting-edge solutions empower businesses—from exchanges and wallets to payment processors and ATMs—to seamlessly integrate reserve-backed tokens across blockchains. By harnessing the power of blockchain technology, Tether enables you to store, send, and receive digital tokens instantly, securely, and globally, all at a fraction of the cost. Transparency is the bedrock of everything we do, ensuring trust in every transaction.
Tether's product suite includes:
•Tether Finance: the world's most trusted stablecoin, USDT, relied upon by hundreds of millions worldwide, alongside pioneering digital asset tokenization services
•Tether Power: energy solutions that optimize excess power for Bitcoin mining using eco-friendly practices in state-of-the-art, geo-diverse facilities
•Tether Data: fueling breakthroughs in AI and peer-to-peer technology, reducing infrastructure costs and enhancing global communications with solutions like KEET, our flagship app for secure and private data sharing
•Tether Education: democratizing access to top-tier digital learning
•Tether Evolution: at the intersection of technology and human potential
Our team is a global talent powerhouse, working remotely from every corner of the world. Excellent English communication skills are required.

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