Responsive Full-Stack E-Commerce Build

I am building a brand-new online store that will sell physical products requiring shipment to customers. I need a developer who can develop me App for Andriod , ios and a website which must be fully responsive—equally smooth on mobile, tablet, and desktop—and developed end-to-end, from database and server logic right through to a polished front-end.

Key functionality I need implemented includes:
• A secure checkout that supports credit/debit cards, PayPal, and a cash-on-delivery option.
• A single, flat shipping fee automatically added to every order, regardless of cart size or destination.
• An intuitive product catalogue with variants, stock control, search, and basic analytics.
• A clean admin panel where I can add products, adjust pricing, process refunds, and view order history.
• Modern security practices (SSL, safe payment tokenisation, and protection against common exploits).

Acceptance criteria for hand-off:
1. Source code delivered via a private Git repository and clearly documented.
2. Deployed demo or staging link proving full responsiveness across common breakpoints.
3. Successful end-to-end test orders using each payment method and the fixed-fee shipping rule.
4. Written deployment steps so I can replicate the environment on my hosting of choice.

Feel free to suggest the tech stack you are most comfortable with—whether that is MERN, Django + React, Laravel, or another modern framework—so long as performance, security, and maintainability stay top priorities. I am ready to start right away and will be active in providing product images, copy, and any branding assets you need.