React.js Developer for Responsive Landing Page

I have an existing e-commerce landing page built with React.js, Bootstrap, HTML, and CSS. I need a frontend developer to make the page fully responsive across mobile, tablet, laptop, and desktop screens. The work includes fixing layout issues, adjusting Bootstrap grid and responsive classes, improving the navbar and mobile menu, fixing product cards and images, and resolving spacing, fonts, buttons, and overflow issues. The goal is to remove horizontal scrolling and ensure the design looks clean on all screen sizes while keeping the existing layout and functionality unchanged. This is a responsiveness-only project; no new features or full rebuilds are required.