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Let's build the
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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

Remote Crowd (HR-Tech Recruiting Marketplace)

PeriodOct 2025 – Present (beta Feb 2026, public launch Jul 2026)
RoleSolo full-stack contract engineer

A commercial two-sided recruiting SaaS built solo — from design to infra, ops, and security

Remote Crowd (HR-Tech Recruiting Marketplace) — Career

01Overview

I own every layer of the commercial SaaS myself: the frontend (Next.js 14), the backend (NestJS, both in Clean Architecture), and the infrastructure (AWS App Runner / S3 / Lambda managed as Terraform IaC). I implemented feature gating across three billing plans and an admin console with a KPI dashboard, audit logs, and CSV export. It runs on change-detection-based selective deploys with trunk-based development and ADRs.

02Highlights

  • Shipped a commercial SaaS solo — from design and implementation to infrastructure and operations (beta Feb 2026, public launch Jul 2026)
  • Solo-implemented security hardening: IDOR protection, nonce-based CSP, account-enumeration defence, admin OTP 2FA
  • Built feature gating across three billing plans and an admin console (KPI, audit logs, CSV)
  • Turborepo monorepo, Terraform IaC, change-detection-based selective deploys

03Tech Stack

Next.js 14NestJSTypeScriptTurborepoPostgreSQLPrismaAWSTerraformGitHub Actions
Official site↗

04Related Projects

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

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