About

Who writes Lief Tech?

I'm a Korean software engineer and founder. I write about the things I'm actively working on: shipping backend services, integrating AI into products, building small businesses, and managing personal finances as a solo operator.

Lief Tech is my public notebook. Posts are direct — I aim to give you the answer in the first paragraph, then back it up with context and examples. No filler, no fluff.

What topics does this blog cover?

• Software Engineering — Java, Spring Boot, Python, Cloud (AWS/GCP), system design, AI/LLM integration
• Business — solo founder lessons, product strategy, go-to-market, operations
• Finance — stock analysis, real estate notes, personal finance fundamentals
• Personal — book notes, retrospectives, everyday learning

Get in touch

Questions, feedback, or collaboration ideas — reach me at lief.ofcl@gmail.com or visit the contact page.