At **Clientify**, we are building world-class products that reach thousands of users daily. We're looking for a **Senior Frontend Engineer** who combines **technical excellence** in **React and Next.js** with **strong knowledge of web application security in Latam** **Your mission** * Lead the development of modern, fast, and scalable interfaces using **React** and **Next.js**. * Design and maintain frontend architectures focused on performance, modularity, and maintainability. * Ensure our applications meet the highest standards of **security and data protection**. * Collaborate closely with backend, product, and design teams, promoting best development practices. * Anticipate and resolve complex issues by providing innovative solutions. **Requirements** * \+5 years of experience in frontend development. * Advanced proficiency in **JavaScript/TypeScript**, **React**, and **Next.js**. * Experience in **SSR, SSG, performance optimization, and accessibility** will be valued. * In-depth knowledge of **web security**: XSS, CSRF, CORS, Content Security Policy, OAuth, JWT, among others. * Experience integrating with secure APIs (REST/GraphQL). * Experience with automated testing (Jest, React Testing Library, Cypress, etc.). * Ability to mentor and guide other developers (PR reviews, one-on-ones, etc.) **.** * Technical English (reading and writing). **We also value** * Experience with related frameworks/libraries: Redux, Zustand, TanStack Query. * Knowledge of CI/CD and deployments on cloud platforms (Vercel, AWS, etc.). * Contributions to open-source projects. * Interest in micro-frontend architecture or edge computing. **What we offer** * Challenging project with real market impact. * Team culture where **technical excellence and security** are top priorities. * Remote working mode. * Competitive salary \+ benefits. * Opportunities for professional growth and technical leadership. If you're passionate about frontend and security and want to make an impact on ambitious projects, we'd love to hear from you. Job type: Full-time Application questions: * Do you have at least 5 years of experience developing frontend interfaces with React and Next.js in production environments (not academic or test settings)? * Have you implemented security measures in frontend applications to prevent vulnerabilities such as XSS, CSRF, CORS, or configured CSP policies or OAuth/JWT? * Have you worked remotely leading or independently developing complete frontend projects, from architecture to production deployment?