Hiroki's portrait

I’m a software engineer specializing in web development and frontend infrastructure. My passion is improving Developer Experience (DX) by creating tools to make development easier.

Open Source

I’m an active open source contributor and go by @privatenumber on GitHub. I have authored several projects, all of which are available for free on npm. Last month alone, my projects had a total of 126 million downloads (that’s 48 downloads every second!).

See all npm packages →

Sponsors

I’m grateful to have been supported by these amazing GitHub sponsors. Their generosity has helped me continue building and sharing projects with the community.

If you benefit from the continued maintenance of any of my projects, I’d love for you to support me!

Services

I love helping developers and teams build better, faster apps. With a focus on frontend DX and infrastructure, I’m available to help you tackle tricky issues—whether it’s optimizing slow builds or debugging complex bugs. If you’re interested in working together, feel free to reach out!

Work

I’m a Senior Web Platform Engineer at Square, focused on enhancing frontend infrastructure across the company. Previously, I worked in the Square Online department (formerly Weebly) on UI component libraries, seller websites, and optimizing site performance. I started my career at Weebly as a frontend engineer, where I discovered my passion for DX. For more details, check out my CV.

Let’s connect

Feel free to reach out on any of these platforms: