Mobile Engineer - React Native (100% Remote)

Location: Madrid, Spain Workplace: remote Join Tether and Shape the Future of Digital Finance 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. Innovate with Tether Tether Finance: Our innovative product suite features the world’s most trusted stablecoin, USDT , relied upon by hundreds of millions worldwide, alongside pioneering digital asset tokenization services. But that’s just the beginning: Tether Power: Driving sustainable growth, our energy solutions 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, we reduce infrastructure costs and enhance global communications with cutting-edge solutions like KEET , our flagship app that redefines secure and private data sharing. Tether Education : Democratizing access to top-tier digital learning, we empower individuals to thrive in the digital and gig economies, driving global growth and opportunity. Tether Evolution : At the intersection of technology and human potential, we are pushing the boundaries of what is possible, crafting a future where innovation and human capabilities merge in powerful, unprecedented ways. Why Join Us? Our team is a global talent powerhouse, working remotely from every corner of the world. If you’re passionate about making a mark in the fintech space, this is your opportunity to collaborate with some of the brightest minds, pushing boundaries and setting new standards. We’ve grown fast, stayed lean, and secured our place as a leader in the industry. If you have excellent English communication skills and are ready to contribute to the most innovative platform on the planet, Tether is the place for you. Are you ready to be part of the future? 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: it’s 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 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 any built something amazing on any p2p frameworks . Important information for candidates Recruitment scams have become increasingly common. To protect yourself, please keep the following in mind when applying for roles: Apply only through our official channels. We do not use third-party platforms or agencies for recruitment unless clearly stated. All open roles are listed on our official careers page: https://tether.recruitee.com/ Verify the recruiter’s identity. All our recruiters have verified LinkedIn profiles. If you’re unsure, you can confirm their identity by checking their profile or contacting us through our website. Be cautious of unusual communication methods. We do not conduct interviews over WhatsApp, Telegram, or SMS. All communication is done through official company emails and platforms. Double-check email addresses. All communication from us will come from emails ending in @ tether.to or @ tether.io We will never request payment or financial details. If someone asks for personal financial information or payment at any point during the hiring process, it is a scam. Please report it immediately. When in doubt, feel free to reach out through our official website.