Arffy

Overview

Team project for an online store selling 20th century European vintage lighting and accessories

Highlights

1. Team Project

   Backend development for a live vintage lighting store operated for 9 months (2023.12 ~ 2024.08)

2. Troubleshooting

   concurrent orders deducted stock into negatives and created duplicate payments — applied pessimistic locking on the stock-deduction path plus a payment idempotency key to prevent negative stock and duplicate charges under concurrent orders

3. Concurrency Control

   Pessimistic locking for inventory deduction and payment duplication prevention

4. Security

   Encrypted personal information storage using JPA Converter

5. Authentication

   JWT token auth + OAuth 2.0 Kakao social login

6. Payment

   PortOne API integration for credit card/simple payment system