Build Two Feature-Rich Online Stores

I need two separate e-commerce websites developed from the ground up to sell my physical products. The exact platform is still open, so feel free to recommend Shopify, WooCommerce, Magento, or another solution if it better fits the brief. What matters most is a smooth shopping experience and the back-end tools I spell out below. Each store must let me: • Track real-time inventory and alert me when stock runs low • Offer multiple shipping options that calculate rates accurately at checkout • Display product variations so shoppers can choose sizes, colors, and any other attributes without confusion . Should have multiple payment options. . After completion you will transfer the complete ownership including blueprints, codes etc. . You will be available and ensure to resolve any issues in the websites. . If everything goes fine we can give you more contracts. I will supply product data, images, and branding assets; you will set up the storefronts, configure the features above, and hand over a fully tested, production-ready pair of sites. Please outline your proposed tech stack, timeline, prices and any past work that shows you can deliver stores with robust inventory, shipping, and variation handling.