E-Commerce Website with Shopping Cart -- 2

I need a developer to build a clean, responsive e-commerce website whose core function is a reliable shopping-cart flow—from product selection through secure checkout. The site should load quickly on desktop and mobile, integrate with a mainstream payment gateway, and include an admin panel where I can add or edit products and track orders.

Key deliverables:
• Fully responsive front-end in a modern stack (React, Vue, or similar)
• Back-end setup for product management and order processing
• Shopping cart with item add/remove, quantity update, and promo-code handling
• Secure checkout tied to PayPal, Stripe, or comparable processor
• Basic analytics hooks so I can monitor traffic and sales

I’m open to your recommendation on platform (custom build, Shopify, WooCommerce, etc.) as long as the final result is easy for me to maintain. Product catalog expansion and user-review features might be added later, so please structure the code for painless scaling.

If you’ve launched e-commerce sites before, especially ones with a smooth cart and checkout experience, I’d love to see your examples and hear a brief outline of your approach and timeline.