Remote Senior Frontend Engineer — Ai Ui Lead
Fullstack
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Job summary
Darwoft is seeking a Senior Frontend / UX Engineer to join a fast-growing U.S. fintech company focused on cross-border payments. You will build Digital Wallet features with React/TypeScript, and employ AI-powered tools to accelerate development.
Remote work in LATAM, with contractor terms and USD payment. You will own frontend features end-to-end, collaborate with product and design teams, and help modernize core platform observability while delivering high-quality user experiences.
Qualifications
- Strong hands-on experience with React, JavaScript, and TypeScript.
- Experience building fintech applications, digital wallets, or payment platforms.
- Solid understanding of UX principles, usability, interaction design, and user-centered development.
- Proven track record of building polished, production-ready user interfaces.
- Experience turning Figma designs or equivalent UX/UI specifications into working applications.
- Practical experience with AI-assisted coding tools such as Cursor, Claude Code, GitHub Copilot, or similar.
- Ability to deliver complete features across frontend and backend boundaries.
- Experience with REST APIs, third-party integrations, and Backend for Frontend (BFF) architectures.
- Strong understanding of frontend architecture, reusable components, and state management.
- Experience working in Agile product development environments.
- Strong communication, problem-solving, and independent execution skills.
- Comfort working hands-on with production code.
Responsibilities
- Design, develop, and maintain Keet Desktop, a cross-platform P2P app built with Pear.
- Translate UX/UI designs and product requirements into functional, intuitive, and responsive applications.
- Collaborate with product and design teams to improve user journeys, interactions, and overall usability.
- Own features end to end, from initial requirements through implementation and delivery.
- Use AI-powered development tools to speed up frontend and full-stack development.
- Build and maintain Backend for Frontend (BFF) services that support application requirements.
- Implement API integrations and supporting backend functionality when needed.
- Ensure consistency, performance, accessibility, and maintainability across the application.
- Take part in code reviews and help improve development practices.
- Find ways to simplify development workflows through AI-assisted engineering.
Skills
Tools
Job description
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.
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.
Our pioneering P2P development platform, built on our open‑source technology stack, Pear, eliminates the need for traditional server infrastructure. Pear platform facilitates direct deployment of applications from the developer’s machine to the user, enabling seamless scalability and performance. By leveraging Node.js-based technology akin to BitTorrent, we create robust peer‑to‑peer connections and data replication systems that set the foundation for a decentralized web.
Learn more about Pear: docs.pears.com
Keet, our flagship P2P communications app, is the first step towards this new era. It exemplifies the potential of P2P technology in everyday applications, from messaging and file sharing to complex collaborative environments, all while maintaining user sovereignty over personal data.
Learn more about Keet: keet.io
In this role, you will be responsible for developing and maintaining Keet Desktop, our cross‑platform P2P communications application built with React and running on the Pear runtime. You'll work on everything from UI/UX implementation to performance optimization, helping shape the future of decentralized communication.
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.
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.
Bonus: Past contributions to OSS projects, especially in P2P or decentralized tech.
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:
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.
Disclaimer – Must read: Commitment & Focus
This role requires full-time dedication, with clear priority given to Darwoft projects during the established working hours. It is not compatible with other full‑time professional engagements. Any additional professional activities must be disclosed in advance and must not interfere with the responsibilities or working hours of this role.
Disclaimer – Must read: Commitment & Focus
This role requires full-time dedication, with clear priority given to Darwoft projects during the established working hours. It is not compatible with other full‑time professional engagements. Any additional professional activities must be disclosed in advance and must not interfere with the responsibilities or working hours of this role.
Darwoft is a software factory that builds custom software solutions and provides IT staff augmentation services for international clients, mainly in the United States and Latin America. We partner with startups and fast‑growing companies to build high‑impact digital products.
Our culture is people‑first, focused on technical quality, long‑term relationships, and collaboration. We combine technical excellence with a close, human approach to how we work.
- Location: Remote – Latin America
- Contract Type: Independent Contractor (full‑time)
- Industry / Project: Fintech – Digital Wallet for cross‑border payments
- Time Zone: ART
- English Level: B2
We are looking for a Senior Frontend / UX Engineer to join a fast‑growing U.S. fintech company that is simplifying cross-border payments and international money transfers, with a strong focus on the Latino community in the United States. You will help build its Digital Wallet, the product through which users manage and move their money.
This is a frontend‑first role. Your main job will be to build excellent user experiences: turning product requirements and UX/UI designs into intuitive, scalable, production‑ready wallet features. You will also use AI‑powered development tools to extend your reach across the stack, including Backend for Frontend (BFF) services, API integrations, and supporting backend functionality, so you can deliver complete features on your own when needed.
We are looking for someone who goes beyond implementing screens. You should understand how users interact with financial products, spot opportunities to improve the experience, and balance user experience, technical quality, and delivery speed. Your work will directly affect how easily and confidently users send money to their families and manage their finances.
- Design, develop, and maintain high-quality user interfaces for a Digital Wallet.
- Translate UX/UI designs and product requirements into functional, intuitive, and responsive applications.
- Collaborate with product and design teams to improve user journeys, interactions, and overall usability.
- Own features end to end, from initial requirements through implementation and delivery.
- Use AI‑powered development tools to speed up frontend and full‑stack development.
- Build and maintain Backend for Frontend (BFF) services that support application requirements.
- Implement API integrations and supporting backend functionality when needed.
- Ensure consistency, performance, accessibility, and maintainability across the application.
- Take part in code reviews and help improve development practices.
- Find ways to simplify development workflows through AI‑assisted engineering.
- Strong hands‑on experience with React, JavaScript, and TypeScript.
- Experience building fintech applications, digital wallets , or payment platforms.
- Solid understanding of UX principles, usability, interaction design, and user‑centered development.
- A proven track record of building polished, production‑ready user interfaces.
- Experience turning Figma designs or equivalent UX/UI specifications into working applications.
- Practical experience with AI‑assisted coding tools such as Cursor, Claude Code, GitHub Copilot, or similar.
- Ability to deliver complete features across frontend and backend boundaries.
- Experience with REST APIs, third‑party integrations, and Backend for Frontend (BFF) architectures.
- Strong understanding of frontend architecture, reusable components, and state management.
- Experience working in Agile product development environments.
- Strong communication, problem‑solving, and independent execution skills.
- Comfort working hands‑on with production code.
- Experience with React Native and cross‑platform mobile development.
- Familiarity with Node.js and modern backend frameworks.
- Experience building and maintaining design systems.
- Knowledge of authentication, authorization, and secure development for financial applications.
- Experience with AI‑driven development workflows and agentic coding tools.
- Understanding of mobile‑first design, accessibility, and frontend performance optimization.
- Contractor agreement with payment in USD.
- 100% remote work in an international setting.
- Access to Argentine public holidays.
- Direct involvement in modernizing core platform observability for a high‑growth fintech ecosystem.
- Professional development, learning platforms, and referral programs.
Explore this and other opportunities at:
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