Frontend Developer Kolkata (India)

Opttab is an AI visibility and GEO platform helping brands understand, measure, and improve how they appear across ChatGPT, Gemini, Google AI Mode, Claude, Perplexity, and other AI platforms. We are building a sophisticated B2B SaaS platform that brings together AI visibility analytics, competitive intelligence, content optimization, website and crawler analytics, integrations, and automation. We are looking for an experienced Frontend Developer who has previously built and scaled B2B SaaS products and can take robust ownership of the quality, architecture, and user experience of the Opttab platform. The ideal candidate combines excellent frontend engineering skills with solid product thinking. You should be comfortable turning complex workflows and large amounts of data into fast, intuitive, and polished user experiences. Responsibilities Develop and maintain high-quality frontend applications for the Opttab B2B SaaS platform Build complex dashboards, analytics interfaces, tables, charts, filters, forms, workflows, and account management experiences Translate Figma designs and product requirements into polished, responsive, production-ready interfaces Work closely with product designers, backend developers, the CTO, and product stakeholders from concept through release Build reusable components and contribute to the development and maintenance of Opttab's design system Integrate frontend applications with REST APIs and backend services Handle complex application states, asynchronous data, loading states, errors, permissions, and edge cases Optimize frontend performance, rendering, bundle size, page load speed, and overall application responsiveness Ensure the platform works consistently across up-to-date browsers and screen sizes Implement robust form validation, authentication flows, authorization, and role-based user experiences Create clear and intuitive experiences for complex B2B SaaS workflows Write clean, reusable, well-tested, and mai