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Design scalable and maintainable frontend/UI architecture. Define technology stack, coding standards, design patterns, and best practices. Develop and govern applications using React.js, Angular, or Vue.js. Build reusable UI components, libraries, and design systems. Work closely with UX/UI designers, backend architects, product owners, and engineering teams. Define micro-frontend architecture where applicable. Ensure responsive, accessible, and cross-browser-compatible applications. Optimize frontend performance, scalability, and security. Define API integration patterns with REST/GraphQL services. Establish frontend testing strategies using Jest, Cypress, Playwright, or Selenium. Mentor senior developers and conduct architecture/design reviews. Support CI/CD and cloud deployment practices.