Middle/Senior React Developer - part time
your mission As a Frontend Engineer at Index, you will primarily focus on building and optimizing high-quality, performant, and SEO-friendly web applications using React and Next.js. You will work closely with product, design, and marketing teams to ensure excellent user experience, strong Core Web Vitals, and reliable analytics and tracking. This role is ideal for a strong mid-level frontend engineer who takes ownership of UI quality and performance and is motivated to gradually expand into backend development (Ruby on Rails and Python) with mentorship and support. Key Responsibilities Frontend Development (React / Next.js) Build and maintain React and Next.js components, pages, and application logic. Implement responsive, accessible, and SEO-optimized UI using modern CSS approaches. Troubleshoot and fix bugs in the existing frontend codebase. Identify and resolve frontend performance issues (code splitting, memoization, lazy loading). Monitor and optimize Core Web Vitals in collabor