OSS Developer / Developer Advocate
I work as an engineer at a global IT tech company while developing OSS libraries and creating content for developers.
Developer Advocate / Solution Engineer | Feb 2023 - Present
Technical consulting and problem-solving across the Wix platform, centered on Wix Developers.
Software Engineer | Jan 2021 - Jan 2023
Development of project management tool Backlog.
Software Engineer | Aug 2018 - Jan 2021
Launch and development of gig work matching platform Sharefull.
Software Engineer | Apr 2016 - Aug 2018
Development of HR management system HITO-Link.
pdfme - An open-source PDF generation library built with TypeScript. GitHub 3,900+ stars, 100K+ weekly downloads.
labelmake.jp - A PDF label creation service for address labels and barcodes. $4K MRR, 300K monthly page views.
CodeZine / Shoeisha - Introduction to Security in the Generative AI Era (4-part series)
Software Design / Gihyo - Feb 2026 Issue: Complete Guide to Vibe Coding
Findy Engineer Lab - How Open-Sourcing My Personal Utility Function Changed My Life
Findy Media - Engineers’ “Don’t Do” Lists
Offers_DeepDive - Security Risks of Vibe Coding: Insights from an Engineer Who Discovered 10,000+ PII Leaks (Oct 2025, 241 attendees)
Developers Summit 2026 - The Trap of Vibe Coding: Security Pitfalls Every Developer Should Know
Channel @kyohei_dev - 5,630 subscribers, 50K monthly views
Topics: Security, AI development tools, OSS, Career
Sponsored content: CodeRabbit, TestSprite, NearStream, Tech-Go, and more (dev tools, gadgets, career services)
Sancha.dev - An engineer community in the Sangenjaya area of Tokyo. Organizer.
I am available for the following work:
For business inquiries: kyohei@pdfme.com
Please include:
Hit me up on X DMs anytime for hangouts or coffee! Let’s grab lunch in Sangenjaya.