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

Cookunity; Neuquén; Remote; ARS 105,893,000 - 180,018,000; Full time

Benefits offered by this job

Contractor in USD

100% remote

Argentine public holidays access

Observability modernization

Professional development

Job summary

Darwoft is seeking a Senior Frontend / UX Engineer to join a fast-growing U.S. fintech company delivering a Digital Wallet.

You will build production-ready interfaces for cross-border payments, applying UX best practices and scalable React architectures. In this contractor role, you will own features end-to-end, collaborate with product and design teams, and leverage AI-assisted coding tools to accelerate delivery while maintaining high quality and accessibility.

Qualifications

• 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.
• Proven track record of building production-ready user interfaces.
• Experience turning Figma designs 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 BFF architectures.
• Strong understanding of frontend architecture, reusable components, and state management.
• Experience working in Agile product development.
• Strong communication, problem-solving, and independent execution.
• 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 requirements into functional, intuitive applications.
• Collaborate with product and design teams to improve user journeys and usability.
• Own features end to end from requirements to delivery.
• Leverage AI-powered tools to speed up frontend and full-stack development.
• Build and maintain Backend for Frontend (BFF) services.
• Implement API integrations and supporting backend functionality when needed.
• Ensure performance, accessibility, and maintainability across the app.
• Participate in code reviews and improve development practices.
• Find ways to simplify development workflows through AI-assisted engineering.

Skills

React

JavaScript

TypeScript

Fintech apps

UI/UX design

AI-assisted coding

REST APIs

BFF architectures

Agile

Communication

Tools

Design systems

Job description

Darwoft is seeking a Senior Frontend / UX Engineer to join a fast-growing U.S. fintech company delivering a Digital Wallet.

You will build production-ready interfaces for cross-border payments, applying UX best practices and scalable React architectures. In this contractor role, you will own features end-to-end, collaborate with product and design teams, and leverage AI-assisted coding tools to accelerate delivery while maintaining high quality and accessibility.