E-Commerce App & Website Build -- 2

I’m launching a new online store and need both a responsive website and companion mobile app developed from the ground up. The entire experience must revolve around a fast, secure checkout powered by Square, so seamless integration with Square’s payment SDK, webhooks, and PCI-compliant handling of card data is the single non-negotiable requirement.

Beyond payments, shoppers should be able to browse products effortlessly—smooth catalogue screens in the app, modern storefront pages on the web, and clean UI components that match my brand kit. If you can add advanced search/filtering and customer reviews, outline those as optional add-ons so I can decide whether to fold them into the initial build or phase them in later.

Tech stack is flexible: React / Next.js on the web and React Native or native iOS & Android are all fine as long as performance is rock-solid and the codebase is well-structured.

Deliverables
• Source-controlled code for website and both mobile platforms
• Fully implemented Square payment gateway with test and live modes
• Deployment to my hosting plus App Store & Google Play submission
• Basic admin guide covering product uploads, order management, refunds, and updates

Acceptance criteria
• All Square payment flows (purchase, refund, saved cards) pass test-card scenarios
• Checkout remains under 3 seconds from cart to confirmation on 4G connection
• Web Core Web Vitals in the green; mobile Lighthouse ≥ 80
• I can pull, build, and run the project locally with a single command

Include a short outline of your proposed architecture, estimated timeline, and any prior examples of Square-powered commerce you’ve built so I can move quickly into design sign-off and development. Show More