Modern eCommerce Website with Custom Options

I’m looking to build a modern website with e-commerce functionality and customizable options.

The website should allow users to browse items, select different options for each item, and place orders. The experience should be simple, clear, and fast.

Main requirements:
• Clean and professional design
• Fully responsive (works perfectly on mobile and desktop)
• Fast loading and smooth performance

Functionality:
• Product pages with multiple selectable options
• Price updates automatically based on selections
• Ability for users to upload files with their order
• Shopping cart and checkout process
• Payment integration (Stripe or similar)

Admin side:
• Manage products and options
• Update pricing
• View and manage orders
• Access uploaded files

Technical:
• No bugs in the main flow
• Secure handling of data and uploads
• Clean and organized code
• Works on all major browsers

Delivery:
• Fully working website
• Basic testing before delivery
• Short support after completion

Important:

Please do not submit a proposal unless you clearly understand the requirements and have experience building similar websites.

The final website must be:
• Fully functional with no issues in the main user flow
• Responsive and working perfectly on mobile devices
• Fast, clean, and easy to use
• Stable and tested before delivery
• Built in a way that allows future updates and improvements

I am not looking for a basic template with minor edits. I need a properly working solution, even if it’s a simple MVP.

Please include examples of similar work you have done.