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Full-stack engineer building AI-powered systems. Open to opportunities in Europe.

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© 2026 Eiji Mitsumizo.

Built with Next.js, TypeScript & Claude Code

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—Career

Educational Content Pipeline

PeriodNov 2025 – Jul 2026
RoleSolo engineer / architect (reporting to the CIO; product led by 2 PdMs)

Structured 20,000+ questions and linked them to exam data problem-by-problem

Educational Content Pipeline — Career

01Overview

After an early single-giant-prompt design failed, I split the work into three layers by responsibility: Extract → Structure → Meta-tag. A strategy pattern makes each layer independently swappable, so a math PoC expanded to every subject with no re-architecture. I designed and implemented a copyright-aware masking subsystem in collaboration with legal, and built the evaluation on both quantitative metrics and a second-pass check where another AI re-solves each question. It is the flagship of my AI-driven development process (spec → discuss with Claude Code → issues → TDD → iterate with Codex + Claude Code review).

02Highlights

  • Structured 20,000+ questions and linked them to exam data problem-by-problem for the first time
  • Three-layer pipeline (Extract → Structure → Meta-tag) with independently swappable stages
  • Designed and implemented a copyright-aware masking subsystem with legal
  • Built an evaluation system where a second LLM re-solves each question to verify output

03Tech Stack

PythonClaude APIGPT APIVLM / OCRDatabricksAzureClaude CodeCodex

04Related Projects

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Solo-built the Java backend of Benesse's "Challenge AI Learning Coach" — one of Japan's first production EdTech generative-AI products, launched nationwide.

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