Mobile Engineer - React Native (100% Remote) - Worldwide
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 general 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.
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
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.
Your Role
You will be the only mobile developer on a new offline‐first iOS and Android app, starting from the first project setup.
The developer accounts, build pipeline and release tracks don't exist yet, so that's where you begin, and you stay on the same app through its public launch on the App Store and Google Play.
Sprints run two weeks with four to five features each, and coding agents write most of the first draft.
You review every diff, add the tests the agents missed, and make the calls on sync, storage and releases.
If you'd rather have a QA team or a release manager handle testing and store submissions, this probably isn't the right seat.
You report to the studio's leadership and work day to day with the lead developer and a backend developer, who's your counterpart on the sync and upload APIs.
You'll also write risk notes and tradeoffs directly to the client team, with your recommendation attached.
Success means sprints that close with their acceptance criteria verified,



a write queue that neither loses nor doubles a submission on real devices, and an app live on both stores where sync failures show up in monitoring before anyone reports them.
You'll:
Set up Apple and Google developer accounts, signing, CI builds and testing tracks
Build the local storage, write queue and retry logic that keep the app working offline
Agree the sync and upload APIs with the backend developer, and decide how conflicting edits resolve
Build phone‐number sign‐in with SMS codes, and push notifications that fall back to SMS
Build camera capture and e‐signature flows that save each signed record as a new version
Measure and improve startup time, memory and app size on low‐end Android phones
Handle store submissions, privacy disclosures and review rejections, and add crash and sync monitoring
You Bring:
4+ years building mobile applications, including React Native applications released on both the App Store and Google Play
Offline‐first work you built yourself: local storage, queued writes, retries and conflict handling
Performance tuning on low‐end Android, with startup time or memory measured before and after a change
Daily use of Cursor, Claude Code or a similar AI coding tool on production mobile work, with TypeScript, automated tests and CI around it
Clear written and spoken English for PR descriptions, risk notes and tradeoff explanations to a client team
Experience working from written acceptance criteria, and the judgment to push back on a merge that misses them
Bonus Points:
An in‐app e‐signature or document flow that stored versioned records
An application built for field, frontline or hourly workers
A localized application, or Spanish for testing the interface
Backend work such as writing an endpoint or a database migration
Crash reporting or sync monitoring you set up and then used to fix a problem seen in the field
What's Offered:
Fully remote contractor role from LATAM, full time at about 40 hours a week
Core hours in US time zones, overlapping with the lead developer and the backend developer
One app to own, from the first project files through public release on both stores
Sync, storage and release decisions that are yours to make, with a backend developer as your counterpart
A team where AI coding agents are part of the daily workflow, with typed code, automated tests and CI in place
Interview Process:
Intro Call: 30 minutes with atomic HR on your background and goals
Leadership Screening: A short call, possibly with an async part first
Product and Developer Conversation: How you take features to merge and agree sync APIs
Take‐Home Test: One feature like the real scope, built and checked
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📌 Desarrollador Mobile React Native Sr - Remoto (Santa Fe)
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