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 integral 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?
About the job
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 Bit Torrent, 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 Responsibilities
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. Preferred Qualifications
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. 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. Your Role
You’ll be the only mobile developer on a new offline‑first iOS and Android app, starting from the first project setup. The developer accounts, build pipeline and release tracks don’t exist yet, so that’s where you begin, and you stay on the same app through its public launch on the App Store and Google Play. Sprints run two weeks with four to five features each, and coding agents write most of the first draft. You review every diff, add the tests the agents missed, and make the calls on sync, storage and releases. If you’d rather have a QA team or a release manager handle testing and store submissions,



this probably isn’t the right seat. You report to the studio’s leadership and work day to day with the lead developer and a backend developer, who’s your counterpart on the sync and upload APIs. You’ll also write risk notes and tradeoffs directly to the client team, with your recommendation attached. Success means sprints that close with their acceptance criteria verified, a write queue that neither loses nor doubles a submission on real devices, and an app live on both stores where sync failures show up in monitoring before anyone reports them. You'll:
Set up Apple and Google developer accounts, signing, CI builds and testing tracks Build the local storage, write queue and retry logic that keep the app working offline Agree the sync and upload APIs with the backend developer, and decide how conflicting edits resolve Build phone‑number sign‑in with SMS codes, and push notifications that fall back to SMSBuild camera capture and e‑signature flows that save each signed record as a new version Measure and improve startup time, memory and app size on low‑end Android phones Handle store submissions, privacy disclosures and review rejections, and add crash and sync monitoring You Bring:
4+ years building mobile applications, including React Native applications released on both the App Store and Google Play Offline‑first work you built yourself: local storage, queued writes, retries and conflict handling Performance tuning on low‑end Android, with startup time or memory measured before and after a change Daily use of Cursor, Claude Code or a similar AI coding tool on production mobile work, with Type Script, automated tests and CI around it Clear written and spoken English for PR descriptions, risk notes and tradeoff explanations to a client team Experience working from written acceptance criteria, and the judgment to push back on a merge that misses them Bonus Points:
An in‑app e‑signature or document flow that stored versioned records An application built for field, frontline or hourly workersA localized application, or Spanish for testing the interface Backend work such as writing an endpoint or a database migration Crash reporting or sync monitoring you set up and then used to fix a problem seen in the field What’s Offered:
Fully remote contractor role from LATAM, full time at about 40 hours a week Core hours in US time zones, overlapping with the lead developer and the backend developer One app to own, from the first project files through public release on both stores Sync, storage and release decisions that are yours to make, with a backend developer as your counterpartA team where AI coding agents are part of the daily workflow, with typed code, automated tests and CI in place Interview Process:
1
Intro Call:
30 minutes with atomic HR on your background and goals2
Leadership Screening:
A short call, possibly with an async part first3
Product and Developer Conversation:
How you take features to merge and agree sync APIs4
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. About Darwoft
Darwoft is a software factory that builds custom software solutions and IT staff augmentation services for international clients, mainly in the United States and Latin America. We partner with startups and scale‑up companies to build high‑impact digital products, combining technical excellence with a people‑first culture built on long‑term relationships and collaborative work. Senior Frontend / UX Engineer – AI‑Driven Full Stack | Contractor | LATAM
General Information
Location:
Remote – Latin America Contract Type:
Independent Contractor (full‑time)Industry / Project:
Fintech – Digital Wallet for cross‑border payments Time Zone:
ARTEnglish Level:
B2About the Role
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. Responsibilities
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. Requirements Must‑Have
Strong hands‑on experience with React, Java Script, and Type Script. 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, Git Hub 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‑Have
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. 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. Explore this and other opportunities at: 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 delivering custom software solutions and IT staff augmentation services to international clients, primarily in the United States and Latin America. We partner with startups and scale‑up companies to build high‑impact digital products, combining technical excellence with a people‑first culture built on long‑term relationships and collaborative work. Senior Fullstack Engineer (React/Type Script/AI‑Assisted Development) · LATAM
Location:
Anywhere in LATAMWork Model:
100% Remote Engagement:
Full‑time Contractor Project:
Fin Tech · Customer Experience Operations Platform English Level:
Advanced Seniority:
Senior 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, availability, or working hours required for 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. Get to Know Darwoft
At Darwoft, we build digital products with heart. We're a Latin American technology company focused on creating impactful, human‑centered software in partnership with companies around the world. Our remote‑first culture is built on trust, continuous learning, collaboration, and strong engineering standards. We're passionate about technology, but even more about the people behind
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