I can build shopping cart website & webview mobile app. I am using OpenCart or Magento to develop shopping cart website and app. 

Full Feature List

• Unlimited Products
• Compatible with IE9+, Firefox, Safari, Opera and Chrome
• One click Installation
• Power full admin panel
• OnePage Checkout Integration (hot)
• Responsive layout for all devices
• Allow to set site title, tagline, logo and Analytics ID
• Support menu with Mega
• Boxed and Wide layouts
• Cloud zoom option for product Images
• Multiple Language support
• Back to top button
• 5 preset Color Styles: Orange, Green, Cyan, Boocdo and Blue
• Fully integrated with Font Awesome Icon
• Support to add custom CSS/JS
• Social Networks integration
• CSS3 table-less design
• LESS for advanced development
• Custom page: about us, contact us…
• Unlimited Categories
• Unlimited Images/Options
• Banners/Slider Management
• Get SEO Friendly Website
• Coupons/Discount Systems
• Get Full Source Code Access
• Product Filter Options
• Live chat integrated

Demo:
http://app.mysarthi.com/ecomm/
http://app.mysarthi.com/hazazionline/
http://www.maaheradesignerwear.com/

You need to tell me the requirement, in the mean time you will get product in your hand.