The English-language job board for Spain

Frontend Software Engineer

Remote, Madrid·Full-time·Added 1 month ago

Tether

15 open roles

Apply

Overview

Job details

Permanent contract
Full-time hours.
Fully remote
Per the ad.

Requirements

Have the right to work in Spain
Tether doesn't mention sponsorship in the ad.
Work in English
English is required, per the ad.
Have senior-level experience
Senior-level role.

Requirements

What we're looking for

Proven experience with React/Preact and modern JavaScript/TypeScript in production-scale applications.
Strong competency in state management (Redux, Redux Toolkit, Zustand, or similar).
Ability to write modular, maintainable, and well tested code.
Solid skillset in testing & debugging complex frontend applications.
Deep interest or experience with P2P technologies or distributed systems.
Comfort working in a remote, globally distributed team; good communication skills.

Preferred Qualifications

Nice to have

Experience with desktop application development (Electron, Tauri, or similar runtimes).
Familiarity with video/audio APIs (WebRTC, media streams) and real-time communication.
Demonstrated ability to optimize UI performance: rendering, memory management.
Experience building cross platform applications (macOS, Windows, Linux, etc).
Bonus: Past contributions to OSS projects, especially in P2P or decentralized tech.

Languages

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.

The role

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:

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.

As a Senior Frontend Engineer, you're not just building interfaces-you're translating AI intelligence into meaningful human experiences. Your work directly impacts how users perceive, trust, and rely on QV.AC, making you essential to the company's success in the competitive local AI assistant market

What you'll do

Deliver new features and bug fixes with a focus on reliability, performance, and user satisfaction
Maintain high codebase quality through consistent coding standards, code reviews, and automated testing
Design and develop responsive, high-performance UI and application state ensuring seamless user experiences across platforms

About Tether

Tether is a technology company operating in the crypto/fintech sector, best known as the issuer of USDT, the world's largest stablecoin by market capitalization. The company provides digital currency infrastructure and financial services, including stablecoin issuance, trading, and related blockchain-based solutions. Tether operates globally with a significant remote-first workforce, and its scale is substantial within the crypto industry, handling billions of dollars in daily transaction volume.

Tether has a fully remote presence in Spain, with roles such as Account Managers, Blockchain Expansion Managers, and AI/Software Engineers being offered as 100% remote positions. The company is known for a remote-first, distributed work culture, making it highly relevant for international professionals seeking flexible, location-independent roles in the crypto and fintech space. Tether's Spanish hiring is part of a global expansion strategy, and the company actively recruits talent worldwide.

Industry: Crypto / Fintech
Founded: 2014
Employees: 50–200
Headquarters: Hong Kong, Hong Kong
Website: tether.to

Good to know if you are moving

Tether operates a fully remote-first model, so all roles in Spain are 100% remote — no relocation to a Spanish city is required.
The company is a major player in the crypto industry, offering exposure to stablecoin infrastructure and blockchain technology.
Roles span engineering, AI research, marketing, and compliance, giving international professionals a broad entry point.
As the issuer of USDT, Tether is a globally recognized brand within the crypto ecosystem.
The hiring process and day-to-day work are conducted in English, making it accessible for non-Spanish speakers.

In their own words

About the company & team

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.

Additional information

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.

All open roles at Tether