Numentica LLC

Compensation

Full Description

This is a remote position. Preferred Location : Mexico or South America (Brazil /Argentina / Costa Rica ) We’re seeking a Senior Front-End React Developer to join a dynamic product team building scalable, user-friendly web applications for a fast-growing startup. You’ll collaborate closely with designers, backend engineers, and product managers to deliver high-quality UI experiences that delight users. Responsibilities Develop and maintain responsive, accessible, and performant React applications Build reusable components and front-end libraries using React, TypeScript, and modern state management tools (Redux, Context API, Zustand) Integrate with RESTful and GraphQL APIs Optimize application performance and implement best practices for scalability Collaborate with cross-functional teams in an Agile environment Write unit and integration tests using Jest, Cypress, or React Testing Library Participate in code reviews and contribute to technical documentation Required Skills 3–5 years of professional experience in front-end development Strong proficiency in React.js, JavaScript (ES6+), and TypeScript Experience with Next.js, Redux, or equivalent state management Solid understanding of HTML5, CSS3, and modern styling frameworks (Tailwind CSS, Styled Components) Familiarity with Git, CI/CD pipelines, and modern build tools (Webpack, Vite) Experience with GraphQL and/or REST APIs Strong testing skills with Jest, Cypress, or React Testing Library Fluent English communication and ability to work independently Prior experience working with US-based teams or startups is a plus Bonus Skills Experience with accessibility standards (WCAG, ARIA) Familiarity with Storybook or component-driven development Exposure to cloud platforms (AWS, Vercel, Netlify) What We Offer Opportunity to work with a passionate, fast-moving startup team Potential for long-term engagement and growth