Kyunghun Kim

DalDal Shopping - Cashback Commerce Service

• Github : https://github.com/KarmaPol/Bibumhada_server
• Service links: https://apps.apple.com/us/app/달달쇼핑/id6477835653

[Tech Stack]

• Java, Spring Boot, AWS(EC2, VPC, Route53, RDS, S3, Elasticache, ELB), JPA, Docker, Github Action, MySql

[Assigned Tasks]

1. Backend development such as product registration and

management, social login, user point deposit and withdrawal registration, etc

2. Build CI/CD Pipeline with Gihub Actions, Docker, Portainer

3. Design AWS infrastructure such as VPC, RDS, Elasticache, and Docker Swarm to build distributed servers

[Problem Solving]

• Solve Concurrency Problem

1. Multiple requests for point withdrawals at the same time cause the point balance to decrease only once

→ Addressing the concurrency issue through DB pessimistic lock

• Improve product registration efficiency

1. Increasing administrative costs due to the administrator having to enter items daily when registering a product

→ Automate product registration by building a crawling server with AWS Lambda, Beautiful Soup

WADIS - Wildlife Disease Control System

[Tech Stack]

• Java, Spring, JPA, Ibatis

[Assigned Tasks]

1. Design and Implement Sample Management Page Features

2. Validation and duplicate inspection when saving samples

[Problem Solving]

• 33% better sample data input performance with large data

→ Improve query entry at once with JDBC template BathUpdate

⇒ Performance improvement of approximately 33% with 5692ms→ 4242ms based on 5,000 data

• Troubleshooting missing data during data input/output

1. Identify the cause of the external library method being an URL query method

→ New client-side save function to communicate with data in json

2. Newly implemented communication functions and legacy code compatibility issues

→ Implement data structure conversion adaptor method

⇒ Consider compatibility with existing code and resolve missing data issues