Senior React/Typescript Frontend Engineer — Ai Ownership
Humand Technologies, Inc.
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Descripción de la vacante
Darwoft is seeking a Senior Frontend / UX Engineer to join a fast-growing fintech-focused team. You will build production-ready wallet features, translating UX/UI designs into scalable React/TypeScript interfaces while leveraging AI-assisted tooling to accelerate development across frontend and BFF services.
You will work with a globally distributed team, ensuring accessible, high-performance experiences and end-to-end ownership of features from design to deployment.
Formación
- 4+ years building full‑stack web applications and releasing them to production.
- Experience turning UX/UI designs into working applications from Figma or similar.
- Ability to deliver complete features end to end across frontend and backend boundaries.
Responsabilidades
- Design, develop, and maintain high‑quality user interfaces for a digital wallet.
- Translate UX/UI designs into functional, responsive applications.
- Collaborate with product and design teams to improve usability.
- Own features end to end from requirements through delivery.
- Use AI-powered tools to speed up frontend and full‑stack development.
Conocimientos
Herramientas
Descripción del empleo
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 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.
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?
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.
Our client is a remote product studio that builds MVPs and custom software for startups and companies past the idea stage. Clients hire them for a fixed-scope MVP or for a product team billed by the two-week sprint, and the whole team uses AI coding tools every day.
They've been at it since 2020 and were profitable in 2025, with a 30% net margin. After building their own AI systems, they tripled monthly revenue with the same team size. Clients rate them 4.9 out of 5 in verified reviews, and the startups they build for have raised more than $25M in venture funding.
You’ll join the team building workflow software for one of the studio’s clients: a live product that needs new workflow features while the existing ones keep running. The client’s own engineers commit to the same repo, so every new table, permission and workflow goes in next to code someone else is changing. The weight is on the server side, from the SQL database on Azure up through the API, and you also build the React and TypeScript screens that sit on top.
AI coding tools draft most of the specs, tests and migrations. You direct them, read every diff line by line, and answer for what merges. If you’d rather write most of the code by hand, this probably isn’t the right seat.
You report to the studio’s leadership and work day to day with the lead developer and the product manager, who sets the acceptance criteria for each sprint. Success means delivering four to five features per two-week sprint, each verified before merge, and owning one area end to end (such as the task engine or the legacy migration) without breaking a live feature.
- Extend the production SQL database on Azure with new tables, permissions and versioned records
- Write the server-side workflow rules: state machines, approval gates and independent review steps
- Enforce role-based access by company and assignment at both the database and the API
- Build the audit log, stale-write protection and idempotent endpoints so a retry never duplicates data
- Build the React and TypeScript work queues, bulk assignment tools and dashboards
- Integrate email, SMS and file storage providers, and design the sync APIs the mobile application calls
- Write migrations from legacy sources, with reconciliation reports and a duplicate review step
- Break each sprint's scope into small PRs and verify every acceptance criterion before merge
- 4+ years building full-stack web applications and releasing them to production
- Experience working in a codebase you didn't write, learning its conventions before changing it
- Hands-on work on workflow software where different user roles see different data, with approvals, task queues or state machines and an audit log or versioned history
- React, TypeScript and SQL on Azure, including schema design and migrations
- Daily use of Cursor, Claude Code or a similar AI coding tool on production work, with tests and CI behind it
- Clear written and spoken English: PRs that say what changed, why, and how it was tested, and tradeoffs explained to another team's engineers
- Experience delivering in fixed-scope sprints with branches, code review and feature flags
- Work in a regulated setting such as finance, health or insurance
- A migration from a legacy system, with reconciliation and duplicate review
- Time as an outside vendor committing to a client's repo
- Project rules, custom prompts or agent setups for AI coding tools that your team adopted
- Spanish, since the platform is bilingual
Fully remote contractor role from LATAM, full time at about 40 hours a week
Core hours in US time zones, so your day overlaps with the lead developer and the product manager
An area of the product to own end to end, with your schema designs reviewed by the lead developer and the client's engineers
A team where AI-first delivery is already the daily routine, with tests, CI and feature flags as part of the normal process
A start in early November
- 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 from acceptance criteria to merge
- Take-Home Test: One feature like the real scope, built and checked
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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