I'm Koshin Takeuchi I live in Tokyo

I've been drawn to making things for as long as I can remember. In school, I wanted to build my own iOS app, so I opened up Swift Playgrounds — and that was my first real step into programming.

At 20, I learned software development at an engineering school and built my first personal project: a simple tool that compares the value of money across different eras. It wasn't a complex product, but I experienced the joy of building something I envisioned and the delight of having someone actually use it.

I joined an SES company and participated in an internal blockchain working group. There, I learned about the potential of cutting-edge technologies and developed a desire to create new products on my own. Later, I joined a startup where I worked with highly skilled members. In a rigorous code review culture, I learned to think about design validity, maintainability, and operability — developing a sense of 'moving products forward with technology.'

I became a freelancer in December 2024. I love using technology as a tool to turn ideas from zero to one. I work in places where I can enhance my creativity across different industries, teams, and products.