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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.

  • Sponsored by getsentry
  • Sponsored by afilio-de
  • Sponsored by thnxdev
  • Sponsored by schoolhouse-world
  • Sponsored by denelop
  • Sponsored by microsoft
  • Sponsored by badrap
  • Sponsored by roboflow
  • Sponsored by typed-rocks
  • Sponsored by webdriverio
  • Sponsored by prisma
  • Sponsored by omanderconsulting
  • Sponsored by syntaxfm
  • Sponsored by endearhq
  • Sponsored by talentlessguy
  • Sponsored by Nutlope
  • Sponsored by stephenh
  • Sponsored by antfu
  • Sponsored by grikomsn
  • Sponsored by matheuspiaui
  • Sponsored by webpro
  • Sponsored by nwalters512
  • Sponsored by remorses
  • Sponsored by kubijo
  • Sponsored by fspoettel
  • Sponsored by Oksydan
  • Sponsored by yazinsai
  • Sponsored by tvup
  • Sponsored by SimYunSup
  • Sponsored by danielpza
  • Sponsored by joshuatz
  • Sponsored by AnandChowdhary
  • Sponsored by divmgl
  • Sponsored by Vages
  • Sponsored by andriyor
  • Sponsored by alexn-s
  • Sponsored by zaripych
  • Sponsored by KemingHe
  • Sponsored by piquark6046
  • Sponsored by hosht
  • Sponsored by transitive-bullshit
  • Sponsored by raquentin
  • Sponsored by fisschl
  • Sponsored by adamsuskin
  • Sponsored by noxify
  • Sponsored by brc-dd
  • Sponsored by eavichay
  • Sponsored by getsentry
  • Sponsored by afilio-de
  • Sponsored by thnxdev
  • Sponsored by schoolhouse-world
  • Sponsored by denelop
  • Sponsored by microsoft
  • Sponsored by badrap
  • Sponsored by roboflow
  • Sponsored by typed-rocks
  • Sponsored by webdriverio
  • Sponsored by prisma
  • Sponsored by omanderconsulting
  • Sponsored by syntaxfm
  • Sponsored by endearhq
  • Sponsored by talentlessguy
  • Sponsored by Nutlope
  • Sponsored by stephenh
  • Sponsored by antfu
  • Sponsored by grikomsn
  • Sponsored by matheuspiaui
  • Sponsored by webpro
  • Sponsored by nwalters512
  • Sponsored by remorses
  • Sponsored by kubijo
  • Sponsored by fspoettel
  • Sponsored by Oksydan
  • Sponsored by yazinsai
  • Sponsored by tvup
  • Sponsored by SimYunSup
  • Sponsored by danielpza
  • Sponsored by joshuatz
  • Sponsored by AnandChowdhary
  • Sponsored by divmgl
  • Sponsored by Vages
  • Sponsored by andriyor
  • Sponsored by alexn-s
  • Sponsored by zaripych
  • Sponsored by KemingHe
  • Sponsored by piquark6046
  • Sponsored by hosht
  • Sponsored by transitive-bullshit
  • Sponsored by raquentin
  • Sponsored by fisschl
  • Sponsored by adamsuskin
  • Sponsored by noxify
  • Sponsored by brc-dd
  • Sponsored by eavichay
  • Sponsored by alcuadrado
  • Sponsored by ai
  • Sponsored by typeofweb
  • Sponsored by gajus
  • Sponsored by niklasschloegel
  • Sponsored by pwn-0x309
  • Sponsored by coderbyheart
  • Sponsored by mmkal
  • Sponsored by sintanial
  • Sponsored by KaisSalha
  • Sponsored by acelaya
  • Sponsored by pseudobun
  • Sponsored by thomasballinger
  • Sponsored by aoede3
  • Sponsored by marvson
  • Sponsored by simonplend
  • Sponsored by mnaoumov
  • Sponsored by fdebef
  • Sponsored by nknapp
  • Sponsored by baltpeter
  • Sponsored by lacolaco
  • Sponsored by eai04191
  • Sponsored by znck
  • Sponsored by electrovir
  • Sponsored by siketyan
  • Sponsored by legitleavitt
  • Sponsored by dansalias
  • Sponsored by votrungquan1999
  • Sponsored by dlants
  • Sponsored by poupalov
  • Sponsored by wellwelwel
  • Sponsored by DarkGL
  • Sponsored by digitalmio
  • Sponsored by kingston
  • Sponsored by ex3ndr
  • Sponsored by MrDeatHHH
  • Sponsored by kiriDevs
  • Sponsored by sapphi-red
  • Sponsored by shannonwells
  • Sponsored by druspencer
  • Sponsored by JaavierR
  • Sponsored by lpgera
  • Sponsored by jahands
  • Sponsored by maorleger
  • Sponsored by shadiflo
  • Sponsored by wjthieme
  • Sponsored by francisu
  • Sponsored by itorisaias
  • Sponsored by alcuadrado
  • Sponsored by ai
  • Sponsored by typeofweb
  • Sponsored by gajus
  • Sponsored by niklasschloegel
  • Sponsored by pwn-0x309
  • Sponsored by coderbyheart
  • Sponsored by mmkal
  • Sponsored by sintanial
  • Sponsored by KaisSalha
  • Sponsored by acelaya
  • Sponsored by pseudobun
  • Sponsored by thomasballinger
  • Sponsored by aoede3
  • Sponsored by marvson
  • Sponsored by simonplend
  • Sponsored by mnaoumov
  • Sponsored by fdebef
  • Sponsored by nknapp
  • Sponsored by baltpeter
  • Sponsored by lacolaco
  • Sponsored by eai04191
  • Sponsored by znck
  • Sponsored by electrovir
  • Sponsored by siketyan
  • Sponsored by legitleavitt
  • Sponsored by dansalias
  • Sponsored by votrungquan1999
  • Sponsored by dlants
  • Sponsored by poupalov
  • Sponsored by wellwelwel
  • Sponsored by DarkGL
  • Sponsored by digitalmio
  • Sponsored by kingston
  • Sponsored by ex3ndr
  • Sponsored by MrDeatHHH
  • Sponsored by kiriDevs
  • Sponsored by sapphi-red
  • Sponsored by shannonwells
  • Sponsored by druspencer
  • Sponsored by JaavierR
  • Sponsored by lpgera
  • Sponsored by jahands
  • Sponsored by maorleger
  • Sponsored by shadiflo
  • Sponsored by wjthieme
  • Sponsored by francisu
  • Sponsored by itorisaias

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: