Senior Frontend Developer

Senior Frontend Engineer
- (Next/React)

Location:
Latinamerica (Remote) Rate: $3,300 USD as contractor (No benefits) Duration: FTE Seniority: 6+ years Experience Required: 6+ years in frontend development, with 3+ years in React and 2+ years in Next.js

About the Role
We are looking for a Senior Frontend Developer to lead the design and development of scalable, high-performance web applications using React and Next.js. You will own architecture decisions, mentor junior engineers, and drive best practices across the frontend codebase. This role also requires comfort using AI-assisted development tools and evaluating AI-generated output for quality, security, and performance.

Key Responsibilities
Architect, build, and maintain scalable, production-grade applications using React and Next.js (App Router, SSR, SSG, ISR). Lead technical design discussions and make architecture decisions for component structure, state management, and data flow. Own performance optimization — Core Web Vitals, bundle size, rendering strategy (CSR vs. SSR vs. SSG), and caching. Review pull requests with a focus on code quality, scalability, accessibility, and maintainability — including code generated with AI tools. Use AI coding assistants (GitHub Copilot, Cursor, Claude, ChatGPT, etc.) to accelerate development, while critically reviewing generated code for correctness, security, and adherence to standards. Collaborate with backend engineers to define and consume REST/GraphQL APIs, including error handling and loading states. Translate Figma/design system files into reusable, accessible, well-tested components. Mentor junior and mid-level developers through code reviews, pairing, and technical guidance. Drive adoption of testing strategy (unit, integration, E2E) using tools like Jest, React Testing Library, Cypress, or Playwright. Partner with product managers and designers to scope features, estimate effort, and identify technical tradeoffs. Stay current with the React/Next.js ecosystem and evaluate new tools, libraries, and AI-assisted workflows for team adoption. Required Qualifications 5+ years of professional frontend development experience. Expert-level proficiency in JavaScript (ES6+) and TypeScript. Deep, hands-on experience with React (Hooks, Context API, component design patterns) and Next.js (App Router/Pages Router, SSR, SSG, ISR, API routes). Strong understanding of state management solutions (Redux, Zustand, React Query/TanStack Query, or similar). Solid grasp of HTML5, CSS3, responsive design, and CSS frameworks/tools (Tailwind CSS, Styled Components, or CSS Modules). Proven experience optimizing web performance and Core Web Vitals (LCP, CLS, INP). Experience with RESTful APIs and/or GraphQL, including authentication (JWT, OAuth). Practical, hands-on experience using AI coding tools (Copilot, Cursor, ChatGPT, Claude, etc.) in a real development workflow, with the judgment to review, correct, and validate AI-generated code. Strong testing background (Jest, React Testing Library, Cypress, or Playwright). Proficiency with Git and collaborative workflows (GitHub/GitLab, code reviews, CI/CD). Experience with web accessibility standards (WCAG/ARIA). Excellent communication skills, with the ability to explain tradeoffs to both technical and nontechnical stakeholders. Preferred Qualifications Exposure to backend/full-stack development (Node.js) for closer collaboration on API design. Experience integrating AI/LLM features into frontend applications (e.g., chat interfaces, streaming responses, prompt-driven UI). Experience with cloud/deployment platforms (Vercel, AWS, Azure). Prior experience mentoring engineers or leading a small team. Bachelor's degree in Computer Science, Engineering, or related field (or equivalent practical experience). Soft Skills Strong ownership mindset and ability to work independently on ambiguous problems. Product-oriented thinking — considers the end user, not just the ticket. Effective mentor and communicator, comfortable giving and receiving direct feedback. Comfortable pushing back on design or product decisions with data-backed reasoning.