Senior Full Stack Engineer (Node.js, React.js, Headless CMS)

J ob Description: Senior Full Stack Engineer (Node.js, React.js, Headless CMS) Experience: 7+ years Employment type: Full-time Location: Mumbai - Kanjurmarg Reports to: [Engineering Manager / Tech Lead] About the Role We are rebuilding our public-facing web platform on a modern, headless architecture. You will design and build the content layer ( Strapi ) and the React front end that consumes it. The work is performance-sensitive, security-conscious and subject to regulatory and compliance requirements. You will be a hands-on senior engineer who shapes technical decisions and mentors others. Key Responsibilities Design, build and maintain scalable web applications using React.js (Next.js preferred) and Node.js . Architect and implement content models, APIs and workflows in Strapi headless CMS (Contentful, Sanity, Directus, Payload, etc.). Build custom Strapi plugins, controllers, services, lifecycle hooks, middleware and policies, and handle upgrades across major versions. Configure roles and permissions, i18n, media handling, and draft/publish and review workflows to meet editorial and compliance needs. Build REST and GraphQL APIs and integrate the CMS with internal services, third-party APIs and authentication systems (SSO/SAML/OAuth2). Optimize for performance, SEO and accessibility (Core Web Vitals, SSR/SSG/ISR, caching, CDN). Write clean, tested, maintainable code, and take part in code reviews and architecture discussions. Own deployments with the DevOps team: CI/CD, containerization, environment management and monitoring. Apply secure coding practices (OWASP Top 10, input validation, secrets management, dependency hygiene) and support security reviews and audits. Mentor junior and mid-level engineers, and document technical designs and decisions. Required Skills and Experience 6 to 8 years of professional software development, including 4+ years of strong hands-on Node.js (Express, NestJS or Koa) and React.js . Proficiency in JavaScript (ES6+) and TypeScript . At least 2 years of hands-on experience with a headless CMS , preferably Strapi (v4/v5), covering content modeling, custom extensions and production deployment. Solid understanding of REST and GraphQL API design. Experience with relational databases (PostgreSQL, MySQL), including schema design and query optimization. Experience with state management (Redux, Zustand or React Query) and modern React patterns (hooks, context, code splitting). Familiarity with Git workflows, CI/CD pipelines, Docker, and at least one cloud platform (AWS). Experience writing unit, integration and end-to-end tests (Jest, React Testing Library, Cypress or Playwright). Good understanding of web security, authentication and authorization. Strong communication skills and the ability to work with product, design, content and compliance stakeholders. Good to Have Experience in BFSI, fintech or other regulated industries , including audit trails, maker-checker approval…