Build and maintain modern, performant web interfaces using React (or equivalent) Build backend APIs (Node.js), orchestration layers, and real-time messaging systems Collaborate closely with designers and product managers to turn wireframes and prototypes into elegant, production-ready experiences Design and implement frontend patterns, design systems, and reusable UI components Handle session management, personalization logic, and dynamic content rendering Optimize for accessibility, localization, responsiveness, and performance across browsers and devices