A shop that holds no stock. Product data and availability come from supplier feeds, a tiered markup is applied, and once an order is paid the admin view states exactly what to order and from which supplier. Includes a PC part-compatibility builder and an automated test suite covering pricing, compatibility, feed parsing and payment-signature verification.
Why it is here The interesting part is the pricing engine: rules that have to hold simultaneously —
tiered margin, a minimum profit after transaction fees, tax, and rounding — which is
exactly the kind of logic that is quietly wrong until it is tested. So it has tests.
Working prototype, sample data, payments simulated