OpenCart Supplement Store UI Redesign

My existing OpenCart-based supplement store needs a complete visual and functional refresh. The top priority is a smoother browsing journey so shoppers can quickly locate products by supplement type or ingredient. While doing so, all current products, customer accounts, order history and SEO-friendly URLs must remain intact.

Here is the scope I want you to cover:

• Modern UI/UX redesign that carries through category pages, product listings and the checkout
• Fully responsive layouts for mobile and tablet
• Clearer product categories and menus, stronger search and filtering, plus richer product pages with “related products” suggestions
• Faster page-load times, basic on-page SEO tweaks and Google Analytics integration
• Streamlined, tested checkout flow with payment gateways verified in both sandbox and live modes

Please send over:
1. Links to OpenCart stores you have redesigned or built
2. A short outline of your proposed approach, including any extensions or themes you expect to use
3. Estimated timeline with key milestones
4. Your quotation, broken down by major task if possible

I’m ready to relaunch as soon as we lock in the plan, so share any clarifying questions along with your portfolio.