- Spring Batch
- Spring Actuator
- Spring Boot
- Spring MVC & Thymeleaf
- Spring Security - Spring Data JPA
- Spring Data Mongodb
- Spring Data Redis

RDB
- MySQL
NOSQL
- Mongo DB
- Redis
TSDB
- Prometheus
ORM
- MyBatis
- JPQL
- JPA
- QueryDSL 

- Grafana
- K6

- MSA, EDA
- TDD
- Clean Code / Architecture
- RestFul