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 | LATAM
General Information
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
About 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, 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‐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.
About the Role (Second Upcoming Project)
You will 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.
You Bring
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
Experience delivering in fixed‐scope sprints with branches, code review and feature flags
Bonus Points
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
What's Offered
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
Interview Process
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
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