VN - Full Stack Frontend Engineer - 143

Our client, a leader in mobile payment systems, is seeking a Senior Fullstack Frontend Engineer to own and solve complex frontend challenges in connected payments. You will contribute to a major payments platform used by over 27 million monthly active users and supporting $100 billion in transaction volume, ensuring reliability, performance, and quality across the web experience.

This role is an opportunity to take technical ownership of mission-critical frontend systems, work across the full stack with Node.js/Express when needed, and improve testing and observability practices using Jest and React Testing Library.

• Design and develop React-based web applications and UI components for a high-scale payments platform
• Build and maintain unit and functional tests using Jest and React Testing Library
• Debug client-side issues and trace problems across the web application stack, including server-side Node.js/Express logs
• Diagnose and resolve production issues, contributing to release support and incident response
• Collaborate with engineers and QA to ensure code quality, test coverage, and reliable deployments
• Review and improve frontend architecture and testing practices
• Implement cross-browser compatible solutions and optimize for consistent user experience
• Contribute to backend endpoints and integrations as needed using Node.js and Express

Requirements

• 5+ years of professional JavaScript experience
• 3+ years of professional React experience
• Proficiency writing unit and functional tests with Jest and React Testing Library
• Practical experience with Node.js and Express and a basic fullstack understanding
• Strong debugging skills and ability to trace issues across client and server logs
• Experience contributing independently to production React applications
• Ability to collaborate effectively with engineering teams for QA and release support
• Solid understanding of testing practices and maintaining test coverage

• Experience ensuring cross-browser compatibility
• Strong CSS skills
• Familiarity with React Hooks
• Experience with Apollo GraphQL