Open to Opportunities in Europe
FoundingEngineer& 0→1 Builder
5 years in EdTech. Four 0-to-1 product launches, including a commercial SaaS on the side. Founding Engineer → PM & Tech Lead of Shinkenzemi √Route, scaling the team from 1 to 26 while architecting the full platform (Next.js × Java × Python). Most recently solo-built an educational content pipeline with Claude Code + Codex, reporting directly to the CIO. Now solo-building and operating a commercial SaaS hiring marketplace.
- /0→1 Product Builder
- /Java & Spring Boot
- /TypeScript Full-Stack
- /AI-Augmented Engineering
- /LLM Pipeline Architecture
- /Team Building 1→26
4×
0-to-1 Launches
1→26
Team Scaled (1→26)
5+
Years of Engineering
1
Patent Co-inventor (JP 7815525)
01Career
Projects
02About
Hi, I'm Eiji
Five years in EdTech at Benesse (2021–2026). I've led four 0-to-1 product launches — three at Benesse, plus a commercial SaaS on the side. I founded Shinkenzemi √Route, a learning platform for high schoolers, as its first engineer and scaled the team from 1 to 26. Most recently I reported directly to the CIO, solo-building an AI content pipeline with Claude Code + Codex. Today I'm solo-building and operating a commercial SaaS hiring marketplace.
- Backend
- Java / Spring Boot (4 yrs) & full-stack TypeScript — robust APIs and production SaaS
- AI & LLM
- AI-driven development with Claude Code + Codex, and LLM pipeline design
- Cloud
- Azure (4+ yrs) and AWS + Terraform — scalable infrastructure as code
Core Technologies
JavaSpring BootTypeScriptNext.jsNestJSAzureAWSClaude Code
03Blog