Hi, I'm Joonseo Lee

I'm a software developer based in South Korea with over 8 years of professional experience (2018~). I specialize in building robust backend systems and have a deep passion for open source software.

What I Work With

Fluent in: Java, Spring, JavaScript, TypeScript, Kubernetes, AWS
Exploring: Kotlin, Go

I enjoy diving deep into the JVM ecosystem, designing clean APIs, and contributing to projects that help fellow developers work more effectively.

What I'm Working On

I actively contribute to open source projects across the Java/Kotlin/TypeScript ecosystem — from workflow engines and observability tools to developer productivity libraries. I believe that well-maintained open source tooling makes the entire software community stronger.

Why Your Sponsorship Matters

Open source work takes real time and dedication. Your sponsorship helps me:

• Dedicate more hours to maintaining and improving open source projects
  • Cover infrastructure and tooling costs
  • Keep learning and sharing knowledge through blog posts and examples
    Even a small contribution goes a long way. Thank you for considering supporting my work! 🙏