Transactional Shopify Storefront & Dashboard

I’m rebuilding our entire online shop on Shopify and need someone who can deliver both the customer-facing storefront and a lightweight admin dashboard. The public side must cover catalog browsing, cart, one-page checkout, and order history, all wrapped in a clean, minimalist aesthetic that feels fast and uncluttered. A hard requirement is that checkout behaves like a true database transaction: inventory counts and order totals must remain perfectly consistent even when multiple customers place orders at the same moment. If you plan to use a custom Shopify app, the Storefront API, or another technique to guarantee atomic updates, outline that approach when you respond. Google Pay will be the first payment method we launch with; future expansion to PayPal, Stripe, or Square should remain possible, so keep the integration flexible. For the back office I need a simple dashboard (can be embedded in Shopify Admin or hosted separately) where our team can add/edit products, view outstanding fulfilment tasks, and adjust stock levels. Real-time sync with the storefront is essential. Deliverables: • Minimalist Shopify theme (catalog, cart, checkout, order history) • Atomic checkout logic with concurrency-safe inventory updates • Google Pay integration, coded for easy extension to other gateways • Admin dashboard for product management and fulfilment tracking • Deployment instructions and a brief hand-off session so my team can maintain the system I’ll review proposals that clearly describe how you would meet the transactional checkout requirement and include links to previous Shopify projects with similar custom logic.