I‘m Jinjae Lee
Software Developer
I am a software engineer with 15 years of experience in backend development and system integration. I have worked on various projects in web services, payment systems, and API design, consistently delivering stable and reliable solutions.
I've been developing backend systems since 2009
I have developed websites and various backend systems for mobile payment companies and online game companies, and have always carried out successful projects through the stability of the service.
Payment Systems
Developed robust payment gateways and integration systems
Game Commerce Platforms
Built scalable game commerce platforms and services
API Development
Designed and implemented RESTful APIs
Web Services
Led backend development of web shop site and event landing page
SQL
Design and implementation of data schema for payments, settlements and analytics
Batch
Developed Spring Batch systems for payment processing, data extraction, and automated notifications
Monitoring
Developed monitoring systems using Grafana, Pinpoint, Sentry
Career History
Kakao Games Europe B.V
Backend Engineer
Developed and maintained web store platforms for Black Desert, Elyon, and ArcheAge. Implemented payment systems and managed backend services for multiple game titles.
Netherlands
Danal Co., Ltd.
Web Developer
Developed mobile payment services and portal systems. Led the renewal project of Danalpay website and developed BilltoMobile portal.
Republic of Korea
Projects
Guardian Tales Twitch Drops Web Service
Developed Twitch account integration and reward distribution system
- Developed backend services for Twitch account integration
- Integrated Guardian Tales login with Twitch login system
- Implemented in-game item delivery API
- Built statistics dashboard using Grafana
Game Web Shop
Developed and maintained web services for game item sales
- Developed and maintained backend and frontend services
- Integrated internal Payment API
- Integrated Payment Gateways (Adyen)
- Integrated monitoring system and alerting system
Payment API
Developed payment RESTFull API service
- Definition and Specification of Payment API
- Developed RESTFull API using Spring Boot, Java
- Created API documentation
- Integrated monitoring system and alerting system
Email Service API
Developed email service integration with Mailchimp
- Definition and Specification of Email API
- Developed RESTFull API using Spring Boot, Java
- Integrated Mailchimp service
- Created API documentation
- Integrated monitoring system and alerting system
Batch Service
Developed automated scheduling service for data and report
- Developed batch system using Java scheduler
- Payment data processing, game item delivery, invoice generation and etc
- Managed system monitoring and maintenance
Black Desert Online Web Shop
Developed the Black Desert Online web shop page
- Developed and maintained backend and frontend services
- Integrated internal legacy Payment API
- Integrated Payment Gateways (PaymentWall)
Payment System
Managed payment settlement, dispute, and web store product
- Operated using third-party payment solutions called Payletter
- Designed UI and function of payment system
- Managed payments, reconciliation, dispute and chargeback
- Contributed to reducing chargeback and refund rate
Brand Web Site Renewal
Participated in the renewal project of the brand web site
- Developed a mobile payment history inquiry page
- Implemented stored procedures
Mobile Payment Service
Maintained mobile payment processing system
- Maintained mobile payment service pages
- Developed automated testing tools using Selenium
- Managed payment processing and monitoring
CRM Web Service
Developed a Customer Relationship Management web service
- Developed web services (Full Stack)
- Implemented stored procedures
- Integrated VoIP using JavaScript
Mobile Payment Web Service
Developed a mobile payment history page for mobile screens
- Developed web services (Full Stack)
- Integrated payment API
- Designed and implemented UI using jQuery Mobile
BilltoMobile Portal / CRM / BackOffice
Developed payment service for North America
- Developed web services (Full Stack)
- Implemented stored procedures