Full-Scale E-commerce Site Build

I need a complete e-commerce storefront built from the ground up. The core goal is a fast, secure, and easy-to-manage online store that can scale as my product range grows. I’m flexible on the underlying platform—Shopify, WooCommerce, Magento, or another proven solution—so long as the choice is justified against long-term maintenance, performance, and cost.

Scope of work
• Craft a modern, responsive design that reflects our brand and works flawlessly on desktop and mobile.
• Configure a robust product catalog, intuitive shopping cart, and fully secure checkout with major payment gateways.
• Set up inventory, tax, and basic shipping rules so day-to-day management is straightforward.
• Optimise page speed, implement essential on-page SEO, and connect Google Analytics for ongoing insights.
• Provide launch support plus a short hand-over session so my team can add products, process orders, and run promotions confidently.

Acceptance criteria
• Pages load in under 3 seconds on a standard 4G connection.
• Checkout is PCI-compliant and encrypts all sensitive data.
• All key user flows—browse, search, add to cart, pay—work across Chrome, Safari, Firefox, Edge, and recent Android/iOS devices.

Please outline your recommended platform, timeline, and any past storefronts you’ve delivered that best illustrate the quality I can expect.