Projects

Career projects where I drove 0-to-1, plus side projects that actually run.

01Career Projects

0-to-1 work, scale, and technical decisions from real jobs.

Shinkenzemi √Route

Founding Engineer → PM & Tech Lead (team scaled 1→26)

Apr 2024 – Mar 2025

Founded a 0-to-1 online learning platform for high schoolers, growing from a solo prototype to PM & Tech Lead of a 26-person team.

Reached monthly profitability within 3 months of launch

Next.jsReactTypeScriptTailwind CSSJava

P—02

Educational Content Pipeline

Solo engineer / architect (reporting to the CIO; product led by 2 PdMs)

Nov 2025 – Jul 2026

Solo-built an LLM pipeline that structures educational content, reporting directly to the CIO — 20,000+ questions linked to exam data problem-by-problem.

Structured 20,000+ questions and linked them to exam data problem-by-problem for the first time

PythonClaude APIGPT APIVLM / OCRDatabricks

P—03

Challenge AI Learning Coach

Java backend API owner (solo, 3-person team)

Aug 2023 – Mar 2024

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

Nationwide launch in March 2024 (national TV campaign)

JavaSpring BootAzure WebAppsOpenAI API

P—04

AI SQL Knowledge System

Solo-built the system, then handed it off for independent team operation

Oct 2025 – Jul 2026

Brought previously outsourced SQL authoring in-house with AI, deliberately discarding a self-built embedding RAG in favour of a platform-native approach.

Brought outsourced SQL authoring in-house with AI (AI generates, humans only review)

Claude CodeCodexAzure AI SearchOpenAI Embeddingspgvector

P—05

Remote Crowd (HR-Tech Recruiting Marketplace)

Solo full-stack contract engineer

Oct 2025 – Present (beta Feb 2026, public launch Jul 2026)

Shipping Remote Crowd, a two-sided HR-tech recruiting marketplace (a client project for remolabo Inc.), single-handedly — from design and implementation to infrastructure and operations.

Shipped a commercial SaaS solo — from design and implementation to infrastructure and operations (beta Feb 2026, public launch Jul 2026)

Next.js 14NestJSTypeScriptTurborepoPostgreSQL

P—06