Middleware Engineer - Fullstack; 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.

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:

Driving sustainable growth, our energy solutions optimize excess power for Bitcoin mining using eco‑friendly practices in state‑of‑the‑art, geo‑diverse facilities.

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.

Democratizing access to top‑tier digital learning, we empower individuals to thrive in the digital and gig economies, driving global growth and opportunity.

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.

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?

You’ll work across the JavaScript and Type Script layer of our local AI stack. Depending on the project, you might build user‑facing applications (mobile or desktop) or contribute to the platform layer that bridges our C++ inference engines with the app ecosystem. Either path puts you at the heart of making local AI usable: whether you’re crafting polished product experiences or building the SDK and bindings that other developers rely on.

This role suits engineers who thrive in a full‑stack JS environment and want to be part of a system where AI runs privately, locally, and fast.

• Own React (Expo/Electron) app development with clean, modular architecture
• Build UI using modern React stack (Type Script, RN Navigation, Zustand/Recoil/Jotai)
• Implement local first / local only apps
• Integrate mobile apps with distributed systems, local inference, and p2p layers
• Strong experience with REST/Web Sockets, async flows, and secure data storage
• Ability to build native modules (iOS/Android) when needed (with some help)
• Good understanding of offline‑first systems, caching, and performance
• Comfortable integrating SDKs (payments, crypto, AI models, etc.)
• Write reliable code: unit tests, E2E tests (Maestro/Appium/Playwright)
• Experience with Type Script across stack (frontend + backend)
• Bonus: experience with distributed/P2P APIs, on‑device ML, cryptography

• 5+ years of experience in Fullstack development
• Expert‑level proficiency in Node.js/JavaScript for backend development and React frontend framework
• Experience with performant data handling on constrained devices (via SQLite or similar)
• Proven experience building and scaling distributed systems or event‑driven architectures
• Experience with containerization technologies (Docker) and orchestration platforms (Kubernetes)
• Proficiency with databases, and a deep understanding of data modeling and optimization
• Solid understanding of networking, security principles, and best practices for…