- Java (1.7+)
- SQL (SQLD certified)
- Spring Web MVC, Spring Boot
- Spring Data JPA, querydsl
- WebSocket(stomp)
- HTML, CSS, JavaScript, JSP, jQuery, jqGrid
- Git, Subversion
- Azure, k8s, Maven, Ant
- Scratch
- Go, C, C#, ASP.NET, python
- Node.js, Windows Server
- Redis, MongoDB
- MSSQL, MySQL, DB2
- PL/SQL, stored procedure
- React, thymeleaf
- Jenkins, Hudson
- Docker
- TinyOS