E-commerce

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JoyMini Flutter App — Cross-Platform Super App Architecture Practice

A social media and e-commerce integrated super app built with Flutter + Riverpod + GoRouter + Dio, covering core features such as IM, LuckyDraw, KYC, e-commerce, and Wallet

Project Cases

Order Payment Pipeline: Coupon + Flash Sale + Coins + Group Buy Four-Layer Price Calculation

An in-depth analysis of the `OrderService.checkOut` method in a NestJS project, demonstrating how to chain four layers of price calculation (flash sale, coupon, coins, group buy) and five subsystems within a Prisma transaction, covering optimistic lock debit, atomic inventory deduction, and a complete refund flow.

Backend Development