We are seeking a Senior Software Development Engineer with expertise in frontend development, specifically as a React.js Expert. The role involves building dynamic, high-performance web applications using React.js and advanced JavaScript concepts (ES6+). Responsibilities include implementing pixel-perfect UI using high-proficiency HTML5 and CSS3, ensuring cross-browser and responsive compatibility. Candidates should have mastery in CSS architecture and styling using modern techniques like Flexbox, Grid, and SCSS, along with knowledge of responsive and mobile-first design. A strong understanding of Object-Oriented Programming (OOP) principles for modular, reusable, and testable code is essential. Basic SQL/MySQL knowledge for frontend data requirements and effective collaboration with backend developers for API integration are also necessary.