Maintain Custom E-Commerce Website

I run a fully custom e-commerce store written in plain HTML, CSS, and JavaScript. Sales are growing fast, so I need someone who can step in on an ongoing basis to keep the codebase clean, the pages up to date, and the shopping experience glitch-free... (Budget: ₹1500 - ₹12500 INR, Jobs: CSS, Frontend Development, Git, HTML, JavaScript, PHP, Web Design, Web Development)