Senior Frontend Developer (Next.Js and React)

Job Title: Senior Frontend Developer (JavaScript, Next.js, React, AI Tools, A/B Testing) Location: Remote – Latin America Preferred (aligned with Spanish business hours 'CET') Type of Contract: Full-Time | Remote Salary Range: $3,800 – $4,800 USD/month Language Requirements: Native Spanish, C1 English We are seeking a skilled Senior Frontend Developer with strong experience in Next.js, React, and modern frontend architecture to join our growing team. You will play a key role in building high-conversion user interfaces, developing internal tools, and optimizing frontend performance. Your work will directly impact user experience, marketing effectiveness, and overall product scalability. Key Responsibilities: Develop high-conversion, visually engaging interfaces using modern design and marketing best practices Build and maintain frontend applications using Next.js, React, and TypeScript Design and develop the frontend layer for internal tools and custom platforms Ensure cross-browser and cross-device compatibility through rigorous testing Participate in code reviews to uphold quality standards and best practices Collaborate with Product, Marketing, Design, QA, and Operations teams Write modular, reusable, and efficient code while continuously optimizing performance Must-Have Qualifications: Strong experience with Next.js and the React ecosystem Advanced proficiency in TypeScript for scalable frontend development Solid understanding of NPM package management, including creation and optimization Experience with AI-assisted development tools and integrating AI into workflows Proven experience in frontend architecture with a modular design approach Strong knowledge of RESTful APIs and/or GraphQL, including async JavaScript (Fetch, Axios) Working knowledge of AWS and cloud-based application deployment best practices Preferred Qualifications: Experience with frontend performance analysis and optimization Familiarity with A/B testing methodologies and tools Experience working with PHP/Twig in frontend templating environments Strong collaboration skills with UI/UX and cross-functional teams Autonomous, proactive mindset with strong problem-solving abilities Additional Notes: Candidates must be comfortable attending meetings during Spanish business hours (9:00 AM – 5:00 PM CET) as required (not daily, but regularly enough to be a key consideration)