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.About Darwoft 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.Senior Frontend / UX Engineer – AI-Driven Full Stack | Contractor | LATAMGeneral InformationLocation: Remote – Latin AmericaContract Type: Independent Contractor (full-time)Industry / Project: Fintech – Digital Wallet for cross-border paymentsTime Zone: ARTEnglish Level: B2About the RoleWe 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.ResponsibilitiesDesign, 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.RequirementsMust-HaveStrong 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.Nice-to-HaveExperience 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.What We Offer (Contractor)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.Join Tether and Shape the Future of Digital FinanceAt 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 TetherTether FinanceOur innovative product suite features the world's most trusted stablecoin, USDT, relied upon by hundreds of millions worldwide, alongside pioneering digital asset tokenization services.Tether PowerDriving sustainable growth, our energy solutions optimize excess power for Bitcoin mining using eco-friendly practices in state-of-the-art, geo-diverse facilities.Tether DataFueling 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 EducationDemocratizing access to top-tier digital learning, we empower individuals to thrive in the digital and gig economies, driving global growth and opportunity.Tether EvolutionAt 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 general 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?
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📌 Senior Frontend Engineer — Ai-Driven Creator Platform (Rincón de los Sauces)
🏢 FullStack
📍 Rincón de los Sauces