Senior Frontend/UX Engineer - AI-Driven Fintech (Remote)

Blacksmith Agency LLC; Municipio de Rincón de los Sauces; Remote; ARS 137,974,000 - 206,960,000; Full time

Benefits offered by this job

USD payment

100% remote

Argentine holidays

Observability modernization

Professional development

Job summary

Darwoft is seeking a Senior Frontend / UX Engineer to join a fast-growing U.S.-founded fintech, building a Digital Wallet for cross-border payments. This remote, contractor role focuses on frontend-first delivery, turning designs into production-ready features, and using AI-assisted tooling to extend capabilities across the stack.

You will own features end to end, collaborate with design and product teams, and ensure accessibility and performance across the wallet product.

Qualifications

• Strong hands-on experience with React, JavaScript, and TypeScript.
• Experience building fintech apps, 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.

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.

Skills

React

JavaScript

TypeScript

Fintech apps

UX principles

Figma to code

AI-assisted coding

REST APIs

BFF architectures

Frontend architecture

Agile

Communication

Production code

React Native

Node.js

Design systems

Authentication & security

AI-driven workflows

Mobile-first design

Tools

Cursor

Claude Code

GitHub Copilot

Node.js

Job description

Darwoft is seeking a Senior Frontend / UX Engineer to join a fast-growing U.S.-founded fintech, building a Digital Wallet for cross-border payments. This remote, contractor role focuses on frontend-first delivery, turning designs into production-ready features, and using AI-assisted tooling to extend capabilities across the stack.

You will own features end to end, collaborate with design and product teams, and ensure accessibility and performance across the wallet product.